Getty Bo Nix #10 of the Denver Broncos walks on the field before a game against the Pittsburgh Steelers. Former NFL quarterback Kurt Warner is a “big fan” of Denver Broncos quarterback Bo Nix , according to the Denver Gazette’s Chris Tomasson. However, Warner disagrees with Broncos head coach Sean Payton that sophomore slumps do not exist. Payton denied such a thing exists, but Warner, who went from undrafted to the Hall of Fame, said it indeed does. Moreover, Warner believes Nix, and for that