All the talk, all the wondering, but we all sort of knew how the OU season opener was going to go. If there was any drama, it would have been of the bad variety. But there wasn’t. Defense was lights out. Quarterback Jackson Arnold had some big-time moments and everybody was breathing fine at halftime. Still things to work on, but OU cruised to the 51-3 opening victory against visiting Temple on Friday night in Norman. Quick-hit takeawaysDifference-making defenseThat’s what OU fans have been waiting for, hoping for when it comes the defense. You’ll take allowing just 80 yard and forcing four tu…