This is the main reason I don't get the consternation... unless it's a true tiemshare with everyone playing tight and being second guessed on every throw.
Tim Tebow as a frosh on that Florida team had 6.4 carries/game, 33.5 RYPG, 8 TDs with 2.4 passing attempts per game with a healthy 10.8 yards/attempt and 4 TDs. So Tebow got about 9 snaps a game and accounted for about 60 yards of offense and a TD. Most importantly, his efficiency numbers were off the charts... he lead every player with at least 50 rushing attempts in YPC, he threw a TD pass every 8 attempts, and his YPA was strong considering he was primarily used in short yardage situations. And if you look at Tebow's stats only over the second half of the season where he played more, they get even more eye popping.
The point is that Tebow wasn't used in place of Chris Leak. He was used in specific situations for specific plays that catered to his strengths. Let's say hypothetically ND uses Zaire like that... I think it's going to be incredibly effective... I just wonder what the fans do when Zaire's per play numbers are mind blowing.