[imported_The Vibesman]

MP3 capped but has quieted since. Think capping hands as maybe AA-TT, AKs (I know the book says QQ or something, but lots of folks may cap w/ JJ-TT - I don't but I've seen it done on Party .5/1). Now if he had AA-JJ, you'd think he'd have shown aggression somewhere here, as he may think he has the best hand, unless he assumes you have made a set. Same w/ A-Q suited, maybe show some aggression on the turn. Funny, I might think he had TT except that you have that, which makes it much less likely he does. So I'm thinking he has A-K. Can anyone see a reason for him to play AA-KK (or QQ-JJ) like this?
I find the passivity on UTG+1's part hard to read. I worry that he's got K-J or J-10 and didn't bet the flop for fear of being outkicked, but wants a showdown. However he could be playing pocket 9's or eights to showdown. These are the only hands I can think of that he would call with that you beat. MP3 probably won't call if he has A-K unimproved. So I think I would check behind. There don't seem to be enough hands you beat that will call you.