Injuries to David Montgomery’s ankle and knee early left Khalil Herbert playing a key role with 157 rushing yards in a 23-20 Bears win. Khalil Herbert on Sunday recorded the biggest rushing day by a Bears back since 2017 but did it in a relief effort, much like he did last season. Herbert ran for a career-high 157 yards on 20 carries and scored on runs of 1 and 11 yards, in a 23-20 Bears win over Houston Sunday, but had the chance only after running back David Montgomery went out in the first quarter with knee and ankle injuries.…