Just go see the Gonzaga game last year. Yes we won, but we fell behind early and a huge reason was because Shaw got ragdolled on the boards and completely pushed around. For a big athletic guy, he is a terrible rebounder who gets bumped off balance very easily. I wish he could fill that Kaufusi enforcer role, but I have not seen it yet in two years.
Worthington can be a banger. Unfortunately he has shown very little offensive skill and was not a very good defender or rebounder either in his two years. He simply doesn't have the explosiveness needed. However, he may be that Kaufusi type for this team to play against bigger and more physical post players. Could be a nice matchup guy.