Maia beats Bisping. Maia has really figured out this MMA thing in recent years. It took him a while, but he's figured out exactly what his skills are and how to best apply them. Bisping's TDD is good, but not THAT good. That seems like a backpack situation to me.
Woodley is a difficult one because his actual striking skills are below average. But his explosiveness, combined with the threat of the takedown, is a real problem for people. I tend to think that Bisping would be able to hang in that fight long enough for Woodley to gas, at which point Bisping's pressure and cardio would take over. Bisping by decision or late finish.
GSP would be a fairly easy fight for Bisping, in my opinion. GSP was already slowing down when he left the sport 3 1/2 years ago. Those knee injuries had a significant effect. Now that he's 3 1/2 years older and hasn't fought during that span of time, it's hard to believe that he'd be competitive against Bisping. Prime GSP beats Bisping. This version of GSP does not.