I don't know why.... but people are underestimating the straw-hats a lot.....
I think I am the only one who thinks Luffy atm is just below the Yonkou level.
If you take hints from the manga.... you will see that after arriving at dressrosa the way Oda split the strawhat pirates, the Strongest 5 went together leaving the other 2 groups weirdly underpowered. Either that or the strawhat powerup is really something. Many things have made it clear. For example tashigi's alarming comment after she saw zoro fight....
"Just what have the strawhats been doing these 2 years??!!"
You see tashigi should have been used to watching highly skilled people fight (Being smokers right hand and all), yet the amazement she showed indicated that she had never seen anyone so strong to be overwhelming.
So I will put it this way, Luffy beats Dofla - But it will not be a cakewalk. (He will perhaps have to reveal a few more of his cards and it will only be because of Dofla's DF ability).
And here is how I scale power ranks....we will begin with highest and descend to the lowest,
- Yonkou - BB, Shanks, Kaidou, Big Mam, Akainu (After timeskip). (This purely dependant on their current fighting strength and nothing else)
- Elite Shichibukai - Luffy, Mihawk, Doflamingo, Aokiji (After timeskip), Garp and Rayleigh (only because they are old and this is after another 2 years have passed during which they are not getting any younger). (Also these are unnaturally strong people even for the shichibukai order)
- Admiral/Shichibukai - Kizaru (Before timeskip), Zoro, Law, Jinbei, Fujitora, Kuma etc. (I am not including Boa for obvious reasons
)
- Below Par Shichibukai - Crocodile, Sanji, Moria.
- Vice Admirals - Cyborg Franky, Kinemon, Smoker (I think he was only working on improving his rank by capturing tons of pirates and neglected his training), Momonga (Before timeskip), Doberman (Also before timeskip level)
- Captain - Brook, Chopper, Usopp.
I did not include Nami and Robin because I don't think they are meant to be frontline fighters and most likely would avoid a fight unless they are pushed to the corner
Also all the strawhats are after TS.