In his range Ad xd is definitly the most likely holding here. Thats why no reraise on the flop. He expects you to lead. I find alot of the more aggressive (3.5) slow down with made hands till the river. Most of there post flop aggression is missed flops or semi bluffs. He hopes you know he likes to bluff. that's why no tricks. He has the nuts and your supposed to call his "bluff"