Derek Carr’s return to the New Orleans Saints’ starting lineup couldn’t have gone much worse.He lost his top target to a concussion when his pass over the middle sailed over his receiver. He lost to the worst team in the league and he became the first NFL quarterback to lose to 31 teams.A day later, he lost his head coach. These are not the Saints of Sean Payton and Drew Brees, to be sure. But Carr and Dennis Allen expeditiously raised hopes of parading another Lombardi Trophy down Bourbon Street when the Saints totaled 91 points in back-to-back blowouts of Carolina and Dallas to start the season.They scored on their first nine possessions in a 47-10 rout of the Panthers in the opener, then topped that a week later at Jerry World when they reached the end zone on their first half-dozen drives in a 44-19 jaw-dropper against the Cowboys.Those …