PHOTO: Kenneth Walker posted his Heisman moment against Michigan with 197 yards and five touchdowns in a 37-33 upset victory over the Wolverines. Visit my website homepage, TomShanahan.Report By TOM SHANAHAN The Heisman Trophy used to be about the best player in college football. Now, it’s about the best player drawing the most exposure playing for the two or three teams contending for the national championship. Those select players, backed up by talent of top recruiting classes supporting…