With Powe and Big Baby already on the roster (and with an added year of an experience), I really don't see the NEED to add a center to the roster for opening night. Would it be the absolute ideal situation? I guess, but this team was winning games at a ridiculous rate before the signing of PJ Brown.
The focus should be on re-signing Posey and, to a lesser extent, finding a veteran backup point guard--a Kevin Ollie type who can sorta take Pruitt under his wing a bit but who Gabe may hopefully be able to beat out for playing time. There's always the possibly of a quality veteran big becoming available during the season, either as a trade, a guy being bought out/released, or even a repeat of the PJ Brown type situation.