The Patriots offensive line has struggled mightily the past three seasons. Bill Belichick tried to fix the unit in last year’s draft by drafting three interior lineman in Sidy Sow, Jake Andrews and Atonio Mafi. All three played but struggled at times and looked rushed. Offensive tackles Trent Brown and Michael Onwenu manned the tackle spots. Brown had a tough season between injuries and not getting a contract extension offer…