+1 Now I can agree with most of what you state. The only thing is with Norman being only 180 miles from Dallas (closer than UT is) that Texas will always be kind to OU in recruiting, with or without being together in the same conference or even playing each other. OU not being an AAU school would lost likely eliminate them for consideration of the B1G. As to the annual game in Dallas, I would imagine that A&M would love to play OU in Dallas every year. It would be another "gotcha" for A&M against Texas.
As far as Oklahoma not being southern, geographically, politically, culturally and climatically, Oklahoma is a much better fit in the South. Heck the last Confederate General to surrender was Stand Watie, who had adopted what is now Oklahoma as his home.