The Chicago Bears returned to the practice field Monday morning for the first time since Saturday’s preseason opener, and Teven Jenkins was at a new position. Last year’s second-round draft pick lined up at right guard, but it will be difficult for coaches to assess how he looked as players were in helmets and shells — not full pads — for the 90-minute practice. Here are four things we learned at Halas Hall, including more on Jenkins sliding inside. 1.