- I forgive you, then, since you're using wikia. Orochimaru has a 5 in genjutsu, which is the highest levels of genjutsu use. Not even kakashi, who broke obito's genjutsu, has a 5. What i'm saying is that, just because orochimaru got caught by the greatest genjutsu user in the show ( he was surprised that was even possible I might add, further exemplifying his genjutsu prowess) doesn't mean his genjutsu skills aren't top tier. Anyway, this is an instance of orichumaru using genjutsu[
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][
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][
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]. It's the best example you'll see in the manga. Another good example was
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i. Take note that the last person to get this deep into naruto's head, when he was about to tap into the kyuubi's chakra, suppressed the kyuubi's power solely because of his magic eyes (Sasuke). Hashirama really has no genjutsu background, so we don't even know how well he deals with it. Fighting madara really doesn't boost this as madara isn't big on genjutsu usage, nor is basic sharingan genjutsu impossible to break. I'd finally like to state that the information on BoD is quite limited, all we know is that it casts perpetual darkness; Considering Orochimaru stated "the darkness faded" when hiruzen sealed edo hashi and tobi, we don't even know how far that darkness extends, and whether it extends to hashi also and he has to traverse through it with his sensing abilities.
-Well, the smaller you make them, the easier they are to thwart by
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. The larger they are, the easier they are to spot and avoid, or maneuver. Really, I can give you a whole bunch of scans of people fighting massive summonings( synonymous with fighting those hands at kyuubi sizes) and avoiding the attacks. This all assumes that these hands can even swat the floor, however, seeing as their wrists originate from the ground, making their levels of movement somewhat restricted.
-Like I said, we don't know how far that darkness extends( if hashi is affected) or how long it's range is, along with the fact that hiruzen seemed to be doing pretty well in it. Furthermore, Snakes posses all their sensor capabilities( I can go run to those Kabuto scans where sasuke explains the snakes could detect their presence through heat and what not), giving a viable defence for BoD through the use of summoned snakes or shadow snake sleeves(refer to scan in previous paragraph). We also don't know how long BoD lasts. Considering it didn't seem to be a big factor in hashi's battle with madara, I don't think BoD is that big a deal. Last thing, you said they can't take it out; Orochimaru snapped shinju like a twig, which is made of mokuton like hashi's jutsu, so i can't take your word for it. By that feat alone, Tsunade should be able to smash those hands once she reaches close enough.
Because it's not an onslaught? Orochimaru's snakes posses sensing, along with orochimaru possessing a may fly variant - shown in part 1 before even acquiring zetsu cells - and hiding like a mole technique. Then we have edo minato and edo tobirama's sensing and edo hiruzen's whatever. For that matter, edo Minato could solo this by suiciding with hashi by using RDS. As stated by the manga, you can't see RDS until your soul is being plucked out, so hashi would have no idea wtf was going on. Then, we have shino's bugs which follow chakra, Samehade which follows chakra, neji who sees chakra through objects, and yamato who can also uses mokuton and mokuton traversal. Hashirama literally can't run nor can he hide.
- Yamato and orochimaru can bypass hobi by roaming through his mokuton. Minato and tobirama can FTG their way through if he's tagged. Kisame can throw up Waterdome around it and follow hashirama's chakra - either he drops the jutsu and drowns, or keeps it up and run out of chakra. I would say tsunade could punch her way through since the force from her punches are applied over a smaller area than a tbb, but meh, I won't go there.
- Triple rashomon. Hashi's rashoumon stopped PS-Dama, so hashirama's offensives are now worthless because of his own jutsu. Oh, and that's the mokujin which is also restricted. Just saying.
- Mokuryu is restricted so I don't need to really defend against it TBH.
- Other way around. Hashi has no intel, they have full.
With ET, they stomp. Without, Orochimaru could take this on his own. His shadow sleeve snakes already showed feats great enough to combat the wood hands( which is his only large sized offence in this fight). Really, there is no conceivable way for hashirama to win this. Shino's bugs alone would relentlessly torture him and try to drain his chakra while he sat on a massive ocean of water. He wouldn't even be able to see the ground.