If he would have used the jab to keep Lara on the outside, and not let him reach his head, like what Wlad does, he could have frustrated lara and tired him out to the point where he should have had a decent chance to either win a deserved points victory or possibly, even a KO from accumulation.
Lara basically is a fighter who is similar to Haye. It looked almost like the Haye fight only with Williams getting dominated. If Haye would have did that to Wlad we'd have... Wlad as the champion and Haye would be robbed.
But Wlad would have had to fight like PW. If haye had fought like Lara, he probably would have, like I said, punched himself out, and it would have been #50