I was skeptical of JB mostly due to the unfair comps to Jeff Green. But that's because I hadn't really seen him play in college, and I didn't watch his YouTube clips until the day before the draft because I was hoping we'd pick Bender or make a trade.
But after seeing his level of aggression in summer league, as well as his remarkable improvement from the meager coaching he received between games, I am convinced he is going to be a special player. You can just tell that he's going to be very, very serious about improving his game and becoming the best that he can be.
Some players show their intensity by jumping around, screaming, beating their chest, flexing, etc. Jaylen doesn't do any of that. But you can absolutely tell that he is super focused and "locked in". The look in his eyes tells me that he's a very cerebral player, and he's looking for ways in which he can win with every action he takes. Right now, this manifests itself in getting to the free throw line, because that's his best skill. He sees that getting to the free throw line is a game within the game. He recognizes that there's a niche he can operate in, and score points doing it.
For a 19 year old to be doing that, I think it's incredible. Once he develops a few actual go-to moves and refines his shooting form, I guarantee he's going to be a 25+ ppg scorer.