David Montgomery is no slouch as an RB2 behind Jahmyr Gibbs, who is close to breaking Barry Sanders' record for number of rushing touchdowns scored before the age of 24. Montgomery has 635 rushing yards under his belt along with eight touchdowns on the year, and he's consistently hovered around 800-1,000 rushing yards per season for each year of his seven year career.
It's what makes his usage this season by both John Morton and Dan Campbell quite confusing.
Montgomery has been a wrecking ball for the Lions up front, averaging 5.9 rushing yards per game over the Lions' last three contests.