When I say «natural» I'm talking about physical tools. No doubt TWill is the better pass rusher because he has 5 or 6 moves that he can win with coupled with great get off and length.Bowser looks very raw to me off the edge. He has traits to be sure but I don't think he's natural rushing the passer at all.
He isn't close, for example to what someone like Tim Williams brings as a pass rusher.
It's possible, given personnel that we see him primarily covering backs out of the backfield. If he can prove an option for shadowing and shutting down Bell out of the backfield, this would be great for year one.
What I mean when I say Bowser is a natural pass rusher is that he has some unreal tools to work with. There are plays where he litterally runs the arc before the T touched him. He has problems disengaging, which is a major problem, but he has it all physically to improve in that area, and by learning a more diverse arsenal should already be a handful for OTs.