Well that was pretty much the point that was made: the crowd was "groaning" when Martinez came back in. And Nebraska scored, so it's completely moot. No guarantees McCaffrey does much better later on given the field position given in the 4th quarter, kind of hard to justify putting your freshman in against a top 5 defense nationally inside your own ten yard line. If they didn't call a bogus blindside block penalty, it's quite possible McCaffrey was left in the game, but we'll never know. Martinez did screw up on that play, but leaving McCaffrey in if you're not playing to win is not that egregious an error IMO.