[Poker monkey]

I don't know, why would BTN check behind on the turn with such a drawey board if he had a strong made hand? He MIGHT do it with 99 or TT, but pre-flop he doesn't really get good odds to call for set value so these hands are less likely. He could check behind with AA-QQ for pot control, but you'll see a missed draw at least some of the time (you need to be ahead 21% of the time to call the river).