First of all, the only reason Gracie was winning all those fights is because he was the first one who masterd the guard and the Gracie Arm Bar. Now that everyone knows it, he'd get his ass kicked. NHB has evolved like hell over the past few years. And to address the first question, I think Coleman possibly used slin and/or GH due to the fact that he recently (within the last 2 years or so) found out he is hypoglycemic.