I didn't say he was. But it's obvious that he could his legs when he had to and wouldn't look like a snail. A good example of this is when he burned the Giants defense for a 53 yard run in the playoffs in 1984. Brady could never do that. Montana having issues looking onto receivers? I've never heard of that. Is that in a book? Regardless it doesn't matter because I wasn't talking about it. So I don't why you brought it up. Or a lot of other things you're bringing up about him good or bad. I was talking about his athletic ability. And Steve Young's. 49ers organization for a while loved guys that could utilize their legs. Brady isn't that and never was. So it was easy to see why he was passed on.
Yes they can. They can also be hindered by them. There are tons of examples in NFL history where quality quarterbacks are stuck on inept teams. Rivers is a living example. Brees as well, although the Saints are finally turning things around on defense. Brady didn't have a stellar receiving core early in his career. What he did have was a quality defense for a long time, and still has one of the best coaches in NFL history. Arguably the best. Brady wouldn't be dragging the Dennis Erickson 49ers to Super Bowls.