I think a guy with stats in the 19/12 range might fold a fair number of Ax hand pre-, meaning A decent kicker and Ax suited are more probable that A rag. Plus this is someone who limps or calls pre- 1/3 of the time. Since he's normally not aggressive, when he check-calls the flop then donks the turn, his range looks weighted toward holdings that beat AQ - AJ, AT, sets, maybe A7. He could have Ax of spades, but I think we're still well behind his range.