Now, as all S.H.I.E.L.D. fans know, if someone is Coulson's foe, that doesn't necessarily make them a bad guy. Remember the late Gonzales (Edward James Olmos)? Sure, he was Coulson's enemy (at first) last season, but he was ultimately working towards the same goal as the S.H.I.E.L.D. team we know and trust. He even thought he was leading the "real" S.H.I.E.L.D.!
So Zimmer (who is currently causing some real hell as a manipulative, morally-questionable producer on Lifetime's scripted drama about a Bachelor-like reality show) might not be some Hydra-type on S.H.I.E.L.D. this season. But hey, we can dream, can't we?