Well, outside of Brady, Bill-boy hasn't had much luck with QBs.
And as a Wyoming fan... Systems most definitely can alter QBs. Josh going into the NFL had bad footwork and very used to hero ball and taking off. The latter kind of helped that first year in Buffalo, but at Wyoming, it was and still is, a "ground and pound" style offense. Well, its supposed to be, but, well, yeah. And because of that, Josh had all the physical ability, but practically no finesse. His screen passing was sadly, about non-existant. Really, his short passing game, even to wide open guys, was 50/50 at best.
My first post, after a couple of years of being lurker, and its something like this. Who knew?