Other than Noel (which has a legitimate argument of being a PF), there is no long term solution at C in this draft. Everyone else is a backup at best.
Noel will never be a 4. He can't shoot outside of 5 feet and his best quality is shot blocking at the rim. Nothing about that says power forward. And Len will definitely be a long term starter in the NBA. The question is whether or not he's an all-star level talent.