While I was a tiny bit surprised, I think I know what his 'logic' was (in addition to the alleged extra possession).
I think he likely thought we were prepped to stop them on the first drive anyway......and that they were MORE PREPPED to stop us early than on, say, the 2nd offensive possession of the first quarter. I think he thought that even if he was wrong, they've been down by 14 before and after getting a feel for our D, he'd adjust.
I also think he was gambling that he was likely to be behind at halftime and wanted first possession for two reasons in the 2nd half:
1) offense adjusts and has new surprises for us
2) his defense adjusts and he gambles on a stop
Where I think this went wrong is - go look at our second half numbers even with the second string playing, esp the last 3 games prior to OU. We punched in 42, 35, and 21 points and won each game, 2 of them blowouts.
I thought he'd take the supposedly easy points while we adjusted to their speed (in his mind).
I think if they'd scored earlier, they would have actually lost by much more than they did - because we kind of let our foot off and let them have underneath plays much of the game to kill time.