He scared the **** out of Bill Walsh. Whenever Bill identified someone with talent, he knew he had to strike quickly because 1. Al Davis already made his move or 2. Al Davis heard about him too and was about to make his move.
Al Davis made the Raiders a playoff team and made them a Super Bowl champion with his roster building.
Al Davis is lightyears ahead of Jerry Jones. The one thing Al Davis didnt do was let go. Thats it.