Nog should be unfinishable and only beatable by split decision unless you're Fedor
He should have "the comeback" as a special move: automatic takedown /sweep+ sub attempt if anyone is starting to beat him.
Anderson doesn't need any special moves. Maybe some flashy "finish him!" moves like the back elbow
I see GSP just having totally overpowered double legs.
BJ's rear naked choke should seriosly be undefendable: No one as of yet has defended it successfully once he's gone for it!
Rampage needs the powerbomb or high crotch slam, Nate the tombstone piledriver.
Dustin Hazelett should have "Crazy Armbar": If hit at the right time, one of a few possible crazy armbars (or inverted armbars) materializes. I'd love to play as Dustin Hazelett, rubber guard, omplatas and armbars all the way!
Thiago Alves should have epic low kicks and flying knee as finishing move.
WAND should have (surprise surprise) a hyper clinch mode in which he murders his opponents via a brutal knee clinic. He should also have the haviest hands at LHW.
So, who's left.... Well Diego Sanchez should have close to unlimited stamina.