Brantley's athletic strength is lateral quickness combined with a muscular frame. He's hard to get by on defense and it's hard to dislodge him from his spot on defense.
Offensively his athletic ability is average. He has a quick first step, but every other step is slow and he can't explode to the rim. He's got solid touch though and he can use his body to score on some players, but will struggle against size/length. Shooting really is the swing skill for him because I don't think he's going to ever be a great finisher in traffic.
The shooting isnt looking great for him so far, but he's going to make the team based on defense and work ethic.