I think Baker was always a gamer. The Browns looked for the shiny and went for Watson. Biggest mistake they could make. Baker had a shoulder injury the year that he looked bad.
I'll throw Alex Smith in there as a guy that benefited from coaching IMO. He wasn't terrible but wasn't good until Harbaugh got there and made him better. Then Reid got him and made him even better. On the Harbaugh topic, I think thus far Herbert has looked a lot better and looks like he has some heart now. Thats coaching.