Nate won the competition clearly, and it’s not just the games that determine the outcome. McD showed last year that he’s willing to make a change when he believes the alternative will make you better. It was not a Tyrod screwing up that led to McD’s decision, it was what Nate was showing consistently in practice— that he could give them more passing options on O.
Allen will take the reins when he shows the same consistency. However, in this case, Allen will also play if Nate bombs or when they are out of contention.