Bad positioning vs. Leader on Flop

In a huge pot like this. He should be raising either the flop or the turn.

Any draw is going to call because of the pot on the flop, so a raise is for value.

On the turn, the only hand(s) he loses to is AA (1x) and AT (3x?) and everyone else who is putting money into the pot is dead.

The river bet is about as standard as it gets, and I am certain it is shipped his way. However the way he plays it, he wins the least amount with a premium hand in a huge pot where people will call just cause the pot is big.