Everyone seems to get confused with several concepts.
Firstly:
Distinguishing Hawk and Thor from regular attacks is quite simple. Hawk (aka fire), or Thor (aka lightning) won't be a feature of Gear Fourth unless it's a more advanced version of one of the previous two. This is because Hawk techniques are a combination of Busoshoku Haki and "Jet" techniques. This makes sense because of the heat of the Steam, and the fact this can most likely be increased with the resilience of Luffy's body as he applies Busoshoku Haki. This allows the flame to be created as his body can withstand more intense heat from the steam.
Likewise, Thor techniques not only require Busoshoku Haki and Gear Third, but they also require Luffy to be airborne. The only two Thor techniques we have seen have been shown while Luffy is airborne. Although it's ridiculous to attempt to explain it with science, the technique makes sense (in "Manga terms") because of Luffys resistance to Electricity and the theme of being airborne works in conjunction to the idea of lightning being a weather phenomenon. It's possible Luffy's body acts as a Pylons insulation element, carrying a current through his body.
Therefore, G4 most likely won't be a full body "Thor" or "Hawk" because they're exclusive to their Gears due to the way in which Luffy's body is effected. They're also dependent on Haki which is not exclusive to Luffy.
Next: people don't seem to realise a new gear means there's likely to be a huge handicap that comes with or after use because this is supposedly meant to take Luffy up to the next level, such strength (at least initially) comes with a price. A full body Hawk or Thor would not produce such extremities. Remember G2 used to tire Luffy and used to (and probably still does) damage his Cardio Vascular system. G3 used to shrink Luffy to compensate as a "reverse oxygen debt"-esque feature, which he has now been able to somehow overcome.
So here we are:
The new Gear will most likely be superior to G3, and require an immense handicap during or after use, possibly extreme pain, possibly immobility, who knows? Here's my theory.
The previous gears demonstrated enhancement in one or another physical field, G2 being speed and G3 being power (NOT to be confused with strength). We have also already seen Luffy inefficiently Gear Stack, which really didn't increase his power at all. However, I believe G4 is an advancement upon this:
So hopefully you're still with me and figured I believe G4 is both capable of enhancing speed and power. This is done through internal combustion as Luffy mixes the steam he creates for Gear 2nd and the air he inhales for Gear 3rd.
How does this work?
Unlike G3; Luffy won't increase the size of a body part to mammoth proportions, nor will he emit steam like he does in Gear 2nd. What he does is he uses his steam to superheat the air he inhales, causing it to detonate within his own body. Ouch.
The severe limitation of this is that the detonation will be extremely painful and probably more damaging that good. This makes it a perfect end-game be all and end all enhancer/technique.
What combustion will do is create shockwaves. Every explosion does. A shockwave alone will enhance Luffy's strength and he will be able to use it to enhance his speed through propulsion from said shockwaves (and the residual heat of the steam from G2 anyway). His mass may increase slightly due to the similarilites with G3, which will create a more muscular looking Luffy, possibly enhancing his muscular strength for short periods of time as well.
Through this theory we will see Luffy take on features of both Gear Second (and therefore POSSIBLE fire for you pyromaniac full body redhawk fanboys) and possibly electricity for you electromaniacs out there. Some people even want to see a hulk-esque nightmare version of Luffy return. The possible increased muscle mass is a good compromise, right?
But the most interesting and exciting part of my theory is the shockwaves. We saw Luffy incorporate techniques and create shortcuts to use them. Such as "Soru", the Rokushiki technique, with Gear 2nd. We know these gears might be linked due to the coincidence of being introduced in chapters 387 and 783. So I believe Luffy has again, copied a technique and created a shortcut to it. Hasshoken-po is by definition shockwave fighting.
And due to Luffy's rubber Body, he can withstand uncontrolled shockwaves. Luffy can also use his rubber body to enhance the shockwaves he creates which in turn enhances his offensive power and his speed. This makes sense as he can't simply learn Hasshoken through copying the Happou Navy, so he needs an incomplete version, again, Gear 2 is an incomplete version of "Soru" as it's a more complicated process and has a negative toll on his body. This will be similar.
Combustion will also force his body apart. This means he won't be able to maintain it for long and will most probably have to be stretched the whole time. This means he may be able to stretch further and faster.
Voila
Firstly:
Distinguishing Hawk and Thor from regular attacks is quite simple. Hawk (aka fire), or Thor (aka lightning) won't be a feature of Gear Fourth unless it's a more advanced version of one of the previous two. This is because Hawk techniques are a combination of Busoshoku Haki and "Jet" techniques. This makes sense because of the heat of the Steam, and the fact this can most likely be increased with the resilience of Luffy's body as he applies Busoshoku Haki. This allows the flame to be created as his body can withstand more intense heat from the steam.
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Likewise, Thor techniques not only require Busoshoku Haki and Gear Third, but they also require Luffy to be airborne. The only two Thor techniques we have seen have been shown while Luffy is airborne. Although it's ridiculous to attempt to explain it with science, the technique makes sense (in "Manga terms") because of Luffys resistance to Electricity and the theme of being airborne works in conjunction to the idea of lightning being a weather phenomenon. It's possible Luffy's body acts as a Pylons insulation element, carrying a current through his body.
You must be registered for see images
Therefore, G4 most likely won't be a full body "Thor" or "Hawk" because they're exclusive to their Gears due to the way in which Luffy's body is effected. They're also dependent on Haki which is not exclusive to Luffy.
Next: people don't seem to realise a new gear means there's likely to be a huge handicap that comes with or after use because this is supposedly meant to take Luffy up to the next level, such strength (at least initially) comes with a price. A full body Hawk or Thor would not produce such extremities. Remember G2 used to tire Luffy and used to (and probably still does) damage his Cardio Vascular system. G3 used to shrink Luffy to compensate as a "reverse oxygen debt"-esque feature, which he has now been able to somehow overcome.
So here we are:
The new Gear will most likely be superior to G3, and require an immense handicap during or after use, possibly extreme pain, possibly immobility, who knows? Here's my theory.
The previous gears demonstrated enhancement in one or another physical field, G2 being speed and G3 being power (NOT to be confused with strength). We have also already seen Luffy inefficiently Gear Stack, which really didn't increase his power at all. However, I believe G4 is an advancement upon this:
You must be registered for see images
So hopefully you're still with me and figured I believe G4 is both capable of enhancing speed and power. This is done through internal combustion as Luffy mixes the steam he creates for Gear 2nd and the air he inhales for Gear 3rd.
How does this work?
Unlike G3; Luffy won't increase the size of a body part to mammoth proportions, nor will he emit steam like he does in Gear 2nd. What he does is he uses his steam to superheat the air he inhales, causing it to detonate within his own body. Ouch.
The severe limitation of this is that the detonation will be extremely painful and probably more damaging that good. This makes it a perfect end-game be all and end all enhancer/technique.
What combustion will do is create shockwaves. Every explosion does. A shockwave alone will enhance Luffy's strength and he will be able to use it to enhance his speed through propulsion from said shockwaves (and the residual heat of the steam from G2 anyway). His mass may increase slightly due to the similarilites with G3, which will create a more muscular looking Luffy, possibly enhancing his muscular strength for short periods of time as well.
Through this theory we will see Luffy take on features of both Gear Second (and therefore POSSIBLE fire for you pyromaniac full body redhawk fanboys) and possibly electricity for you electromaniacs out there. Some people even want to see a hulk-esque nightmare version of Luffy return. The possible increased muscle mass is a good compromise, right?
But the most interesting and exciting part of my theory is the shockwaves. We saw Luffy incorporate techniques and create shortcuts to use them. Such as "Soru", the Rokushiki technique, with Gear 2nd. We know these gears might be linked due to the coincidence of being introduced in chapters 387 and 783. So I believe Luffy has again, copied a technique and created a shortcut to it. Hasshoken-po is by definition shockwave fighting.
You must be registered for see images
You must be registered for see images
And due to Luffy's rubber Body, he can withstand uncontrolled shockwaves. Luffy can also use his rubber body to enhance the shockwaves he creates which in turn enhances his offensive power and his speed. This makes sense as he can't simply learn Hasshoken through copying the Happou Navy, so he needs an incomplete version, again, Gear 2 is an incomplete version of "Soru" as it's a more complicated process and has a negative toll on his body. This will be similar.
Combustion will also force his body apart. This means he won't be able to maintain it for long and will most probably have to be stretched the whole time. This means he may be able to stretch further and faster.
Voila
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