Erm, did you guys see the pic of Rory for this fight?
Penn's a tough dude but Rory is a new breed.
I think Rory will roflstomp him.
Penn might keep Rory at distance with his boxing for a couple minutes, maybe even get a nice surprise takedown, but then Rory's strength will overpower Penn and he'll big brother him.
Yes Penn is looking in decent shape at 175 ...but Rory's looking even better at 190.