Pretty standard opening of the hand. Everyone seemed to wanna join the party so I completed from SB with 77, figured there to be at least one other hand out there better than mine so there was no point in 3b to isolate.

The craziness just kept on coming. I checked my flopped top set in what I thought was a pretty decent board, was looking to c/r if there was a squeeze spot (considering how many people was in the pot).
When the BN cold 3b this kind of board does he have the nuts every time? Since we were 5 players to the flop there is certainly a possibility of someone having 64s in their range. I decided to call, because there aren't many ranges BTN could have other than nut heavy at this point, the other hands than 64 he could have is 55 and maybe 33, I have those crushed and don't mind seeing the turn. As for the others getting a good prize to draw, there aren't that many draws on the board that would want to continue at this point, most decent players would dump 56/76/ combos at this point (seeing that there is so many turns that are gonna be barreled when they don't improve). But what do I know.. The original flop bettor calls the 3bet, and so does the HJ ( with an awesome prize that is, so he probably has those kind of cards in his range).

Should I rather have cold 4bet the flop to isolate the cold 3bettor in case of him having 55/33? Its not likely he folds those hands, at least not 55, but he's also very likely to have the straight, in which case at least I'm giving myself the opportunity to fold disgusting turn cards or hit a boat.

Pretty decent turn card if I wasn't up against 64 on the flop. As BB only called with 4 players already in the pot pre- he never has aces in his range. Maybe he could have 24 in there, but thats a long stretch in a Rush game. When he donks the turn I figure he might have picked up equity in some kind of combo draw (str+flush), or that he has hit two pair with the ace. My assessment of the flop play by BTN doesn't really change after he jams the turn. He's really likely to have flopped the straight, or he has one of two hands; 55 / (less likely 33).

I took my time bank down to 3 seconds before calling.. (Probably incorrectly after the line taken by BTN?)