Wild as it is, just after seeing summer league, I'm sold that he could be just as annoying on defense as Bowen was.
If he gets to stand in the corner on offense and save energy for defense, there's no reason his floor isn't super annoying defensive pest.
The thing is that everyone switches now, so the days of Kobe vs. Bowen are kind of over. Teams will just screen you and force a switch to get you off their alpha dog scorer. It was notable during the finals because Indiana had a dude fighting through almost every screen so he wouldn't get switched off SGA, but that's playoff level intensity only to fight that hard. During the regular season we just don't see duels anymore between stoppers and scorers.
So with that said, I'm looking for deflections, ball pressure and opportunistic steals out of Bryant. That's elite defense these days, and if he does that, he's a net positive when he's on the court and this (in my mind) at a Bowen like level of being one dimensional but still a contributor.