Rework his role on the team massively then sure, aint no problems on my end.
Hopefully there's enough size and athleticism between Milan, Omaha, and Tre (or improvement from Ward with a full offseason working with Kyle Green) or a transfer post, then Rob's role is something like...
-- team leader/culture guy/great in the locker room/blah blah you know the clichés
-- five hard fouls off the bench/"break glass in case of emergency" big man
-- needed for matchups against an opponent with a true center to bang with him in the paint
If he's doing roughly that 10~ minutes per night, then it is fine. Might even be a great role player!
If he's starting and playing 20+ minutes per night, we might have some problems.