I think we can take 57 out of the equation, and AA? It's possible (though unlikely given his flop bet - and I'm fairly sure this guy would raise PF with it) and I think if he has it we pay it off with good grace. 77 and A5 are the only real concerns. So I guess my main river question is - do enough hands call my push that I beat? Should I be betting for value instead? I don't think I can try a second check/raise here.