Pika was a giant and you are telling me that DD couldn't see him getting his head destroyed by Luffy? And that for someone who has the KD and thus the CoO? And Law is still cuffed. Again why the hell would he go inside a small sewer? Underestimation or not, having beating strong opponents or not, why would DD go into a bloody sewer? If he wanted revenge, then the more logical approach would be to do in public to simply make a statement, not crawl into some small sewer.
I wasn't saying that he didn't saw Luffy blowing Pika's head off. I said that when he was on Pika's body, he is still a long distance away from the palace. He even arrived behind Cavendish who took the 'long way'. Also I don't think that CoO works like a GPS, in FI Luffy wasn't even able to distinguish Caribou from a monster, so I doubt you can pinpoint people with it.
Not sure what your point is with Law being cuffed is, but if I was a villain and I would be able to trap 2 of the strongest enemies who are devil fruit users in a tiny cave filled with water, I would take it. It's more logical to me than going in public and risking that other people join the fight like the arena people and the strawhats.
Doflamingo is now in a position where he can easily strike down both Law and Luffy fairly easy, instead of waiting on his throne, seeing his kingdom burn, getting law uncuffed and his henchmen die. If doflamingo is able to defeat Luffy he would paralize this entire revolution against him.
Also Fujitora is still a wild card, if he would fight publicly Fujitora might decide to protect the country, don't forget that he wants to get rid of the schichibukai system.
So did the funk brothers betray luffy? They led him to to well/cave
Yes, obviously they betrayed him, because it was a dead end, and they said they found a short cut. You only know if it's a shortcut if you know where it ends.
I already said that Kelly Funk would be fighting against the good guys in a earlier chapter discussion thread. Because he was one of the few named arena people who didn't return.
I didn't think it would be like this, I imagined Kelly using his coat on a big character like Chinjao so that he could control him.