That's not exactly fair.
He's at least responsible for getting the Big 12 into position to potentially benefit from this. I mean, just think about the perception of the Big 12 two years ago. Everyone just assumed that it was dead in the water when OU/Texas announced they were leaving. The consensus at the time was that the PAC and/or ACC would expand and take the best of the remaining programs* and the rest would be left for G5 death. (Just go back and look at this thread at the time for lots of examples, lol)
Instead, he kept the conference alive long enough to out-maneuver the PAC and essentially hasten its demise and allow him to add four new solid programs; now he's in a position to step on the ACC's throat as well.
This turn of events would have been seen as WILDLY unlikely two years ago.
* I believe if Yormark was heading up either of those leagues, that's EXACTLY what they would have done instead of sitting on their hands only to get out-flanked and implode.