Arch's redshirt has zero to do with the situation. For one, the only way Arch is in college 5 years is if he's a complete bust. Secondly, even if he played against BYU in an all hands on deck tryout and was clearly better than Murphy he could have played every game up until Thanksgiving and kept the redshirt. Third, you know what's more important than a third string QB's redshirt? Winning the fucking conference and getting in the playoff.
Also, I think Sark isn't handling this like a true head coach. He's handling it like a former college quarterback and offensive coordinator who refuses to bench one of his guys that he recruited. He did the exact same thing last year with Ewers. Remember the TCU and Oklahoma State games? Even though Ewers was almost solely responsible for losing those games he refused to bench him. He stated that young quarterbacks have to go through those growing pains to develop. A head coach should always put the team ahead of a young quarterback's development, but this one doesn't. And that's going to get us beat if we aren't as lucky as we were last Saturday.
Unlike KSU who is built offensively in the worst possible way to attack Texas's best in the country run defense, TCU is built in the best possible way to attack our defense. Their strength is the passing game and their receivers are fast and talented. They will move the ball against us all day long, but somehow they are worse in the red zone than we are, so the defense is going to have to make plays to keep them to field goals. I do not feel good going on the road with a turnover prone, inaccurate quarterback against a team whose offense can easily attack our weakness. Unfortunately, we don't have a head coach like Saban to save Sark from his worst tendencies.