Sort of tough to answer that one. That's like asking what we would conclude if Isi Sofele rushes for 300 yards and breaks 5 tackles on each run. If that happens - would you conclude that he's the best RB we've ever had? Really hard to draw conclusions based on a premise that is yet to occur, and appears unlikely based on existing information.
If the defense plays lights out again, the most natural conclusion would be (i) the defense is inconsistent, (ii) Clancy knows how to scheme against UO and motivate his guys to execute against them, and (iii) some of our younger players have started to come into their own.
I don't think it's impossible that our defense does a good job tomorrow, but I'd be surprised if we really shut them down (which to me would mean <400 yards of offense, <4 TDs) based on what I've seen with my own eyes this year.