Kirk Cousins is not throwing play-action passes more or less than he did during his three-year run as starter in Washington, where he ranked as the No. 1 (2015) and No. 2 (2017) play-action passers by rating. But perhaps it’s time to put Cousins under center even more with the Vikings’ change at offensive coordinator this week, firing John DeFilippo and promoting quarterbacks coach Kevin Stefanski, whom Pat Shurmur wanted as his Giants coordinator last spring. The Vikings offense can’t overhaul in Week 15, but what they theoretically can do is revert to some of the basic principles that led to last year’s success under Shurmur and quarterback Case Keenum. Leader among those principles, in the passing game, was Keenum’s prolific throwing after faking a handoff.