I've never had a problem with Durant leaving OKC but man, watching Al Horford this season has to make you feel bad for Thunder fans.
Had Durant resigned with OKC, Horford would have followed him to OKC. With Westbrook, Roberson, Oladipo, Durant, Horford, Adams, Kanter (granted he was unplayable), Waiters, Sabonis they had more than enough to beat OKC.