Right now, from the look of the pictures (and missing Roberson might play into this, but who knows) BJ is moving on the baseline to wing, one picture was him covering CJ on an entry pass. He might be working out as a 3 right now.
Still, I've seen some dribbling skills in practice, so he's a really hard read in that manner.
Either way, having a guy of that height that can shoot over any guard is a really nice, unconventional weapon that we haven't had in recent years. Southerland had that ability as a forward, but this guy is practically the same height and might end up playing guard this year. Mind, beyond blown.