I am calm but looking at your previous few posts, you were constantly putting Casey down and saying things like he hasn't shown anything on the field. That just is not true. He had a terrific bowl game and had a decent scrimmage until he threw the pick. Some guys just show up when it matters the most. I think based on his bowl game performance, he deserves to start unless he has been performing way worse than Card in the scrimmages.
The problem with having a local product as one of our QBs is that a certain section of our fans would always prefer him over the other guy regardless of their performance. Same thing happened with Sam, and I am afraid it's already starting to happen with Card. This type of attitude will keep the out-of-state kids away from Texas.
Let Casey start and keep him in a short leash. If he doesn't perform, then you have a legitimate excuse to replace him with Card and nobody can say we give local kids preference. Unless of course Sark sees Card as the future and thinks he is ready.