If the question is greatest player, I'd go with OJ...just edging out Bruce. For sheer talent, he was spectacular. In any game, at any time, wherever the Bills were on the field, he was a threat to go all the way.
On a side note, it's amazing how lucky Buffalo sports fans were in the 70's. You had OJ playing for the Bills. Gil Perreault & the French Connection on the Sabres, and Bob McAdoo on the Braves.