John Calipari’s demeanor gave it all away. As he desperately screamed and waved his arms Sunday afternoon while he watched his top-ranked team’s seven-point lead begin to evaporate in the final minutes of the SEC tournament championship game against third-seeded Vanderbilt, he was helpless. He tried everything, but nothing could stop his team’s collapse. And as the final seconds ticked away in a deflating 71-64 loss…