One major question mark in Warren's evaluation as a NBA prospect revolves around his outside shot. He made just 29.5% of his 3-point attempts on the season, although he does make over one per game. Some of this has to do with poor shot-selection, but his inconsistent shooting mechanics play a substantial role in these mediocre percentages from beyond the arc as well. Warren shows sloppy footwork and a significant ball-dip on the catch, not getting his feet underneath him and fading away badly on most of his attempts.
He's often talented enough to throw ball into the basket regardless, despite his poor mechanics, which leaves some hope that he'll be able to figure it out in the pros with better coaching and more practice time. His consistency has improved as the season moved on, as he made 35% of his 3-point attempts in ACC play (17 games). NBA teams will likely want to get a better feel for this part of his game in private workouts, as his ability to space the floor effectively from the small forward position will likely play a major role in whether or not he's ultimately successful.
Another question pertaining to his role-player potential revolves around his passing ability, or rather lack thereof. He's dished out just 32 assists on the season in over 1000 minutes thus far, or one every 33 minutes he's on the floor. His assist percentage ranks third worst among DX Top-100 small forward prospects, and things were even worse last season as a freshman with better teammates around him, as his 5.9% assist percentage was identical to Shabazz Muhammad's.