By Bonnie Stiernberg “The Best Is Yet to Come” — the third episode of HBO’s Winning Time, which aired on Sunday night — ends on a shocking note. After meeting with Jerry Buss and negotiating a deal that would bring University of Nevada, Las Vegas head coach Jerry Tarkanian onboard to coach the Lakers, Tarkanian’s close friend and business manager Vic Weiss is found dead in the trunk of his car, Buss’s business card stuck to his cheek. The implication on the show is that the mobsters who had been staring Weiss down from afar at the restaurant during his meeting with Buss whacked him because the…