The biggest problem with Agbaji right now is that he's not an NBA level ball handler at his position. He simply can't put it on the floor at all against SG's, which really limits what he can do on the court. And you can't use him strictly as 3&D guy on the wing because he's undersized. If you don't have modern NBA wing size, you need to be a threat to drive, and he isn't at this point.
In other words, he's a tweener until he seriously improves his dribbling.
When you get a 4 year NCAA player who was heavily featured on his college team, you expect them to be much closer to a "finished product" than someone who was a one-and-done. Unfortunately, I don't see a really high ceiling for Agbaji. He looks like a career 7th or 8th man to me. Don't see much trade value either.