Keep in mind that his wife is pretty involved in Mary Kay - headquarters Dallas, TX.
If I were going to bet a dime to dollar, I'd say she wants to be more involved in headquarters operations, so she wants to be in Dallas. That leaves Bob in retirement and living in a city without as much to do as he would normally have in Norman. He's probably finding something fun to do with his time while he's in Dallas supporting his wife's endeavors. Find some new friends living in his new town. If that's the case, I'm glad he's not such a curdmudgeon as to tell his wife to pound dirt.
Guess where the Big XII headquarters is as well? Also a nice international airport good for traveling to games around the country if one were to be an analyst. Etc, etc. Still close to Norman and family and friends.
And lastly, imagine being able to attend all of those great Dallas area Friday night games and evaluate players for your school?