You realize that by losing this game, Texas Tech has no shot at winning their division, right? It wouldn't matter if it were 65-64, it would still ruin the season goal. Texas Tech gambled to try to get back in the game, and it didn't pay off. Onside kicks, 4th down tries, etc. Big risk/reward potential. It didn't work out for them, namely because Tech's o-line didn't protect worth anything tonight. The D-line of OU dominated this game, and completely controlled TT's game plan. You can't go to your bread and butter (passing all over) if the o-line can't keep blocks.
Just as one game didn't prove Leach as a good coach, one game won't define him as a bad one. Their gameplan, offensively is still good. They were just outmanned. Once it piled on, they had to get silly with their plan, because it was the only possible chance of getting out of the hole they were in. Once that happened, OU pinned their ears back and made the Tech O-line look stupid.