I gave both credit to TCU's Defense and offense. Simply said Oregon losing their starting QB and Center played a huge role in them scoring 31 in 1h and so little in 2h.
You realize TCU is probably the most injury decimated team in the country right? This is why zero people believe you are actually an ISU or Big 12 fan.
They had 6 of their original defensive starters out for the season, possibly the best QB in the nation and possibly the best WR in the nation out just off the top of my head. There's no "injury" argument against this TCU team.