Hard to say what woulda happened if TCU scored the TD, but what definitely would have happened is the game woulda went over... one of the worst ways Ive lost a total in some time...
Literally a half an inch from the goal line and 2 plays and you dont sneak it with your big physical QB whos been running them over for the last 20 minutes?... 4th down play you hand off 5 yards behind the line to a small-ish RB?