NEW YORK — Dan Quinn’s hiring as the Washington Commanders’ new head coach doesn’t shake the ground in the NFC East the way Ben Johnson’s would have if he’d left Detroit. Certainly not the way a Bill Belichick, Mike Vrabel or Pete Carroll hiring would have, either. To begin Washington’s ‘new day’ under owner Josh Harris, the Commanders could have rattled the cage a lot more than this. Quinn went 43-42-0 in 85 games as the Atlanta Falcons’ head coach from 2015-20. He will be delegating the offense, not running it. He is a familiar foe, a known commodity. He coughed up a Super Bowl to the Patri…