Die-hard Birds fan here myself...
TCU has a lot of injuries on defense. I think they now have 1 returning starter on D. But those young guys who are thrust into starting roles should be getting up to speed after a few games. Patterson is a defensive minded coach and I think TCU's defense improves as there season progresses. As for this week, imo Texas does not have the offense to keep up like TTech. Texas has not played a decent defense except for Notre Dame and they have the Red River Rivalry next week(look ahead?).
It is a lot of points, but TCU may actually be a little undervalued right now.