That 6x BB raise I find to be more often than not AK, or a big pocket pair, and occasionally AQ, AJ, KQ. I LOVE taking a flop with J9s against AK / Big Pocket Pair and will all day if given the chance. I don't always play J9s to a raise... if stacks are shallow, villian is VERY good, or villian is strangely bad I will not.

There is no way an overpair checks the turn, even if they did just flat call the flop (which is pretty unlikely). Alot of players at this level will just call QQQ on the flop but I find it pretty unlikely they would check behind with this hand. His preflop action, turn action and then big river bet are very inconsistent. He could have maybe QQQ, JJJ (unlikely of course) but there is one hand that is VERY consistent with his play throughout. AdKd. So I called, and that's what he had. I'm glad a diamond didn't come : )