Watched some vid, I think he should be higher rated than he is. Not super athletic but good foot work and has a good offensive game.
BJ is quick but is about as athletic as Trey Thompson (imo) I have however observed flashes reminiscent of 80’s NBA era player from Leed, Alabama.
He is definitely a banger inside but with the shot motion Wrist to full release point of a SG which is a rarity among bigs. It looks quite natural which indicates he is indeed a thteat beyond the arc.
He’s more athletic than Trey and also a much better scorer.