I think we overrate Dieng a bit around here. He'd basically just add to our pile of middling bigs, and I don't see him as much of an upgrade over Sullinger other than bringing a skill we don't have in our toolbox otherwise (shot blocking).
I disagree though just because the fit is better than these other guys. We could benefit from a longer, defensive Center next to Olynyk who should be playing more I think.
I mean really, the team is playing small often. If you were alternating between him, Amir, and Olynyk for times I would like that more than Sully out there at C. Kevin O'Connor had a piece today about how so far when Stevens has gone small with Sully at C the team has been playing much worse than with others. He is a player who has merits but I just don't think he fits the system that well and he doesn't have that much potential to get better, I don't think. He hasn't shown any progress in getting in shape.
So I would say because the team could be playing smaller, we could use Centers more than PFs. We would be playing Crowder or Jerebko at PF a lot.