Alleyne is often late on closeouts and gives up quite a few 3's to his man as a result.

At the other end of the floor, he tends to take shots that are outside the flow of the offense, particularly when he misses his first few. It's not just that he's missing shots, he's taking bad shots.

I think a lot of people just assume that when a player remains as a starter even while struggling offensively, that player must be a good defender. The reality is that often, it's more the case that coaches just tend to be stubborn with their rotations.