Super Cool Beas
There are quite a few other unconscionably bad defensive players at guard and forward that are easily forgettable, we just see Mully's inabilities on a daily basis.
The one thing I will give him over these other turnstiles, to me it looks like Mullens actually tries on defense. He gets his hands on balls, he attempts to get into position. He just doesn't have the natural instincts and strength to be more effective.