Josh Norman wouldn’t be back in Buffalo for a second stint if not for a rash of injuries depleting the Bills’ defense. What the veteran cornerback, however, made clear on Wednesday is he would not have signed to Buffalo’s practice squad a day earlier if he didn’t still regard the Bills as contenders, however banged-up they might be. Difficult as it will be to replace linebacker Matt Milano (lower right leg), cornerback Tre’Davious White (torn right Achilles tendon) and tackle DaQuan Jones (torn pectoral muscle), Norman placed his faith in Buffalo’s deep and disruptive defensive front as being a difference-maker.