Nathan Peterman is signing to return to the Bears as a third quarterback according to an NFL Network report. If the Bears bring in an undrafted rookie quarterback or even a draft pick to battle for the third QB spot, he’ll have competition. According to a report by the NFL Network, Nathan Peterman is going to sign to return to the Bears. Peterman, 28, was the third Bears quarterback last year and was with the team only on a one-year contract. He would be behind Justin Fields and PJ Walker. He actually didn’t make the team and was on the…