First of all, I'm surprised that it did not take long for Luffy to pick a fight with Kaido. I don't blame Luffy for trying, but he should know that he can not defeat the final boss so early. At least it was enjoyable watching Luffy beat the snot out of Kaido's men before this happened. I was hoping that Law would retrieve Luffy, but Hawkins got in the way and Luffy is thrown into a prison again. The good news is that Law got away and Kin'emon's plan isn't entirely ruined yet. Once again, Luffy's luck played a role. Kaido could have killed Luffy right there, but he decided that Luffy is worth keeping around and I'm sure we can all expect that he's going to regret it later. I'm certain that Luffy's experiences inside Udon prison is going to fuel the fire inside him. I wonder what Big Mom is going to do if she heard about this.
As for Luffy's current predicament, I predict that he and Kid will eventually start an uprising. I'm also guessing that one of the allies Kin'emon was searching for is there as well. I hope that Luffy won't think about tearing off some of his limbs again. In any case, Luffy's recklessness gave his friends more things to worry about. Besides planning for the final battle, they have to plan a rescue operation as well and who knows what Zoro is going to do. If Luffy can escape with help from inside the prison, then that would be great. Also, if Luffy ends up gaining more allies for the final battle, then it might be worth all the trouble. Things do happen for a reason after all.