TCU has had consistently good defenses since joining. Especially given the offenses they face yearly. Sure, they have a down year here and there, but they're also doing it with a lot of players that Texas wouldn't bother to recruit.
I expect that kind of consistency at Texas. If TCU can do it, then Texas can do it.
Expecting defense that is consistently at the level of TCU, at The University of Texas, isn't too much to ask. It's just not. And it is my expectation. Any and every time we don't manage it, I am disappointed.