First of all, I don't even know what to say to the "Denard has'nt done jack for Michigan" comment. That's just poppycock, is what that is.
Second, and I'll type slow for you, no one is saying that if the reanimated corpse of Joe Montana were Denard's backup we wouldn't give the guy some run. It's that Devin is not ready yet. Denard gives us the best chance to win, and until he doesn't, he should start.