That beat you:
99/TT = 12
AQ = 12
KQ = 12
36 hands

I don't see him holding anything with a J or he'd have raised on the turn. With passive players, I easily see them passively calling down top pair. AA/KK are out since he didn't raise the flop or turn.

Hands you beat:
AK = 16
AT = 16
77 = 12
40 hands you beat.

I don't see him calling 2 bets on the flop with 55 and lower given all 3 flop cards would be over his pair.

So, there's more hands you beat than beat you, but how many of those hands is going to call a river bet with? Frankly, I'm astounded he called with ace high. This is where a WTSD% is useful as a read. For those that only go to showdown 30%, I'm crediting them for a hand. For those at 50%, I feel better putting in a value bet at the end.