Will was doing that in his 30s. Peyton is a young'n
Not as good a shotmaker as Barton now yet if Watson can build his strength and be a crazy-hard worker, his shotmaking will improve. Defensively, he can be superior to Barton. His rebounding too could become much better than Will.
Watson will live in the G-League this season like Malik Beasley once did but he was drafted as a long play and not an immediate contributor, IMO.