As one of the most articulate figures in MMA, Chael Sonnen will engage you in just about any conversation you’d want to have about the sport. But don’t ask him to sit down and walk you through one of his old fights. Three-time UFC title challenger Sonnen (31-17-1 MMA, 7-7 UFC) was the first guest on MMA Junkie’s new series, “Legend 2 Legend,” as he joined former UFC site coordinator Burt Watson to shoot the breeze on a wide range of topics. But perhaps the most interesting tidbit from their conversation was the revelation that Sonnen had never watched back his infamous UFC 117 defeat to Anderson Silva. In fact, he said he has never watched back any of his fights