[Chris Daddy Cool]

on the flop i think villians most likely hands are 66/44/33 or a non-nut flush and if he's a wild one a pair with the Ac, probbly Ac6x.

he doesn't 6bet you on the flop so i'd rule out the nut flush (its my experience that if a player with the nuts sees a guy still wants to put action on the flop with unlimited raising they'll play along rather than "wait" till the turn).

when villian checkraises the turn he has a flush like almost never and i think its pretty bad to checkraise a six here anyways so it rally looks like quads, 44 or 33.

when the river puts in the 6, i like a raise because you are now a favorite gainst his range of hands.

also i'm kind of surprised everybody has villian on a flush. imo its much more likely that villian thinks that it is HERO who has a flush.