@DynamiteShikoku:
WARNING : long theory post ahead! (sorry if someone already mentioned similar stuff before)
from this chapter and a few chapters back, we know that dofla's 'dream' is to destroy the world and the nobles. However, before monet 'died', she believed that dofla will become the pirate king (there must be something to this). this makes me think that maybe dofla had a change of heart somewhere along the line.
we know that kid dofla dislike the nobles for not letting him back so it is safe to assume that dofla's 'dream' to destroy the world is his 'original dream', the dream that he had since he was a kid. However, as he grew older, living his life a pirate, getting nakamas, sailing the seas, etc. he realized that life as a pirate was not so bad at all and maybe he started to forget his 'original dream' and make a new one which is to be the pirate king (as monet said). THIS is the dofla that both bellamy and law once adored.
but then something happened, one of the reason i can think of is that dofla realized that he got powerful and influential enough to carry on his 'original dream'. hatred grew inside once more and he finally decided to follow his old dream afterall. corazon disagree with this, thinking that it's better if they continue their current dream. both dofla and corazon insist on their opinions and that's why dofla killed corazon and law left him. dofla turned back into his hateful self.
with this scenario, i think it is possible for law to bring back the old dofla that he once adored at the end of the arc. dofla will then decide to leave his underworld business and become a simple pirate again and to follow his dream to become the pirate king and become luffy's rival. (kinda inspired by the game unlimited world RED)
with that scenario, kaidou will surely get mad at dofla and that makes me think that maybe when luffy finally get to fight kaidou, law will join him again and this time, dolfa will too (i always want this scenario since punk hazard). so it'll be luffy + law + dofla (and maybe drake) vs kaidou. i know that luffy might not want to team up with dofla but he did have the same situation with croc back at impel down. luffy didnt want croc to join but he realized that he indeed need his power to escape. maybe it will be a similar case with dofla later.
i believe that this will happen after luffy defeat big mom though. there's like a little pattern since fishman island. in FI we got introduced (somewhat) to big mom but then in the next to arc the yonkou that keeps being mentioned is kaidou. that's why i think we will switch back to big mom first before luffy finally get to fight kaidou. so i believed it'll be luffy + jinbe + kidd + hawkins + apoo vs big mom and then luffy + law + dolfa (+ maybe drake) vs kaidou.
I don't think there was any change of heart at any point, if anything his desire propably only got stronger after he witnessed Roger's last words. It might have influenced him to believe that by becoming the Pirate King he could achieve all the fame, power and wealth Roger was said to have. After all, those are needed to destroy the WG (world). Interestingly enough, the popular theory that Straw Hats will destroy the WG after finding One Piece is somewhat similiar what he seems to wish.
Bellamy might have adored that part of Doflamingo, but that's not the case with Law. The kid wanted the same things he did, that's why Doflamingo has been so hell-bent on wanting Law on Corazon's seat. It was kinda like evil inherited will.
Of course Corazon was able to somehow turn Law from his ideals and turned him away from Doflamingo's evil will to his own inherited will and the result of that is clear.
We will see Doflamingo again after this saga, but I don't like to speculate anything further about that just yet.
Your most likely right about that pattern, but I don't even think Luffy will even have a serious fight with Big Mom because she is a woman(even though she is hideous), rather that arc's main enemy will propably be an Admiral and/or the other Alliance. I even dare to say that at some point she will turn into a normal sized woman after Vegapunk handles the gigantification toxins out of her body. Yea, I really like the theory of Doflamingo weakening the Yonko…