Definitely not an elite athlete by any means breh, but Philly is one of the few franchises that should be uniquely used to a drop big scheme. He's a really plus paint protector, stellar rebounder, and split a ton of time playing 4 for us this past year. I wouldn't say he's some amazing perimeter defender or anything, but it's not something he's foreign to doing.
I would honestly say his IQ as a defender is on a level to what you may have seen from early JoJo. The physical ability (especially with that being skinnier Joel + before the injuries) is not at all on that level though lol. I'll be honest there