In D1, I'd say Coleman, Bundy or Knox.
Meredith could struggle with Kirn too much for OW.
In order to get OW, Coleman has to have developed another takedown besides the fireman's that he couldn't hit well on Bundy last year.
Knox could have problems if a tall guy can stay away from his upper body in tie-ups, and his ducks, high crotches and blast doubles on his feet. Oh, and also the inside trips. If someone can go three periods and wear him out, he won't look like an OW in period 3.
I don't see Creagan dominating enough for OW, but I could be wrong.
If by chance, Kirn beats Meredith and dominates everyone else, he would deserve it.
In D2, it's Dunning, Marable or Manson.
I wouldn't put it past Manson to so thoroughly dominate 125 that he can't be denied OW.
Just the thoughts of an outsider with no axe to grind.