Rory has lots of upside, but IMO his stand-up is still a very obvious work-in-progress; Mills was giving him all he could handle.
Was there even any stand-up in that fight? If there was, it couldn't have been any longer than ten seconds worth. Che got raped in that fight.
If Rory dismantles Penn, which he will, I'd like to see him fight Ellenberger. I'd give Rory a slow build.