Rebounding bigs are pretty useful, even if they can't score points. If you decide to cut him, wait at least till signing starts. This way you can say, get 4 guys to consider you, sign 2 at signing and if no one comes to poach your recruits, you cut him and sign the other 2. Last thing you want is to cut right away, and then only sign 3 players and have to take a walkon.