By Alek Arend Ken Dorsey isn’t leaving the Buffalo Bills, notching a massive victory for Sean McDermott and Co. There was some concern Dorsey would leave the Bills to join Brian Daboll’s staff as an offensive coordinator for the Giants. The Bills, though, beat the Giants to the punch. The Bills have promoted Dorsey, the team’s former quarterbacks coach, to offensive coordinator. This is a big win, especially for Josh Allen who Dorsey has worked closely with. “The Bills have their new offensive play caller,” the team announced. “After reportedly interviewing a few outside candidates in the last…