Last season, Khalil Tate was on the short list of preseason favorites for the Heisman Trophy. As Arizona prepares to open this season on Aug. 24 at Hawaii, the junior quarterback is a longshot. Tate rushed for 1,411 yards and 12 touchdowns in 2017, including two games of 230 yards or more. Last season, he had only 224 yards and two scores on the ground as he dealt with a myriad of injuries,…