[ononimo]

first - i would have re-raised to isolate UTG and UTG+1, particularly since you don't respect their play ... don't understand the smooth-call at all with so many players behind yet to act.

once the play develops as you've described and using your reads, i'd put CO on a relatively wide range of hands (medium-high suited connectors, any pair, broadway med-to-big Aces) since the only player he'd really fear playing back at him would be the original raiser (since each successive caller is likely a weaker and weaker hand).

the scary player is the button who just cold called 1/3 of his stack. he's either a complete donk or waiting/hoping for UTG or anyone else to re-raise so he can get his AA in to as big of a pot as possible.

i don't like pushing AKo here after all this action while the button has me covered. if i had the button covered, i'd push.