[Nick C]

I think raising the turn is something to consider. However, MP2 did cap preflop and is going to have a bigger pocket pair a fair amount of the time, I think. Getting 3-bet wouldn't be much fun, because if you get 3-bet, there's a really good chance MP2's big pair contains a diamond and you're drawing to 0-2 outs, but I don't think you can fold, since he might just like his diamondless AA a lot and possibly he just has a set of jacks. However, if MP3 called two cold after a 3-bet, that would be troubling, but then again he's a calling station, so who knows?

On the river I guess that you should probably bet, but I don't think checking is so bad, really. Better hands won't fold, many worse hands will, and sometimes you'll get called by a better hand that's scared of the flush.