Missouri's been playing with Franklin pretty much hurt all season (shoulder, knee), refusing to take painkillers, and saying that the pain while playing has made him question his confidence in his own throwing ability in-game.
When he's been out, they've been forced to play a Redshirt Freshman who can't really run, with only about 2-3 real games under his belt, and who can take pressure from a blitz (which, per below, they're so deep in their line that they can't stop a basic one)
They've lost their starting LG, RG, and RT since the beginning of the season and have been forced down to the point of playing freshmen and a walk-on-that-earned-a-scholly on their line. Their injuries have also forced them down to their 3rd string center (& their starting CB and I think a LB has been hurt on defense)
They're pretty much at the bottom of the conference in points scored at this point, and really the only one playing well is the DT who made the "old-man football" comment (he leads or is near the top in tackles by interior linemen in-conference) and the punt-returner