Keenum could leapfrog Yates (maybe eventually Schaub)

In some cities, quarterbacks are battling for the starting job.  In others, the fight is unfolding at a lower level on the depth chart. In Houston, second-year signal-caller Case Keenum could be in the early stages of making a checkers-style series of jumps that could eventually put him in the starting job. For now, Keenum…