By Evan Bleier Since Kirk Cousins played his last game in Washington during the 2017 season and departed for the Minnesota Vikings, 10 quarterbacks have started games for the newly named Commanders. Outside of Alex Smith, who was a competent NFL quarterback, Washington has largely relied on a stream of has-beens and never-weres at QB over the last four seasons. They are, in no particular order: Smith, Josh Johnson, Colt McCoy, Mark Sanchez, Case Keenum, Dwayne Haskins, Kyle Allen, Taylor Heinicke, Ryan Fitzpatrick and Garrett Gilbert. (Fitzpatrick is okay.) Now, thanks to an almost incomprehen…