"Drew Brees did it," Guenther said. "I know Drew is a little bit thicker than Johnny but about the same height. ... I don't see any reason why he can't do it up there. (Manziel) was such a high-profile guy out of college and everyone expected what he did at Texas A&M, but it's a man's game, it's a lot different, and it takes time. You have to take your lumps a little bit."