Last year, the star of Josh Pastner’s first highly touted recruiting class decided to throw caution to the wind and make the boldest of predictions. “We’re going to win the national championship this year,” Will Barton said. “I’m guaranteeing it!” Sure, Barton was merely having some fun and trying to motivate his teammates; there was no reason to hold his feet to the fire. Whatever, right? Still, needless to say, Memphis did not win the national title. In fact, the Tigers mostly sputtered…