So I just watched the game on TV. Others are welcome to correct me if I'm wrong because I watched it but not with slow mo or anything. In fairness to Denman, in the 1H he got blown up by AZ on a run play where AZ's motor was an issue (that's not uncommon). The only other play I saw was where Nassib simply beat him.
In the 2H, I saw one run play very early in the 3Q where Nassib beat him badly for a TFL. With 8:35 in the 3Q, he got beat badly on the play that led to the Reid INT but it was just a poor pass by Laviano. Denman being beat didn't impact that play IMO.
At 6:08 in the 3Q, Denman got confused and AZ beat him untouched on a pass play. He let him go because of a twist by Nassib but didn't touch either of them. Bad play for him.
At 2:04, he got beat by Nassib on a run play and gave up a TFL. The next play Nassib beat him and faced an early throw that prevented a RU first down at first but was overturn by replay.
I stopped watching it after you elected for the FG with 10:38 in the 4Q when down by 21. That being said, the play prior, Denman did a very nice job on AJ and held his block throughout the play.
Quite frankly, I think the OP is off base. Denman would have been a nice addition to PSU.