It's flat-out ludicrous that the former backup to Brady's backup would even exist so high on this list, but Brissett has been a joy to watch this autumn. Now entrenched with the Colts and playing a key role in place of Andrew Luck, the 6-foot-4, 235-pounder operates as a scrambling, big-armed, old-school whirlwind who isn't afraid to attack defenses with a slew of aggressive downfield darts. As much as the Coltslong for Luck, we'll miss seeing Brissett on a weekly basis when he's shipped into the background upon the veteran's return. ... Maybe you believe I have Mahomes too high here. Too high for a guy with no regular-season snaps to speak of, but Alex Smith's understudy was an object of pure fascination in the preseason. Raw moments aside, the first-rounder displayed a rocket arm and Brett Favre-like derring-do, giving Kansas City one of the deepest quarterback rooms league-wide. ... Like Garoppolo, McCarron spent all offseason bathing in trade gossip, but the Bengals thought enough of their backup to refuse a second-round pick in return for the 27-year-old quarterback. As with Brissett and Mahomes, McCarron projects as a future starter, either in place of Andy Dalton or somewhere far beyond.