The Eagles RB has come on strong the last six weeks after adjusting to his third-down role and putting up 112 yards and one TD in a divisional-round win over the Giants PHILADELPHIA – It wasn’t a good summer for Kenny Gainwell. There were too many dropped passes. Too many mental mistakes, one of which drew the ire of head coach Nick Sirianni during one of August’s joint practices against the Cleveland Browns. It’s winter now, and, like the seasons, the Eagles running back has changed. He has found his footing over the last couple of months and, in the…