WAND maybe (just maybe) still has what it takes but he'd have to count with Rampage pushing it up to the fence. But Randy would probably work at that with Silva. If that problem plus the slams are overcome he at least has the firepower.
Other than that maybe Houston if the fight doesn't go on for more than 3 minutes, then Houston would gas. (Partly a joke). But we need to see his ground game.
Maybe Forrest but I think he'd get beat on the feat and not being able to take it to the ground, or get taken down and overpowered.
Sokoudjou and Arona definately need to arrive.
Soko vs Houston in a KO power match!!!!! WAR SOKO!!!! Like a five second long fight
EDIT: Maybe Lyoto if he can stay elusive (wich will be hard in the clinch)