Fantasy Upside
David Montgomery could be considered the new Jamaal Williams in Detroit and should get a bit more freedom as a back. Chicago gave a good bit of work to Khalil Herbert, capping Montgomery's value there. Yes, the Lions did draft Jahmyr Gibbs, but he'll play more of the D'Andre Swift role. Montgomery could see plenty of early-down work and goal-line work, as Williams did.
Fantasy Downside
With Gibbs in the mix, Montgomery probably won't factor a ton in the passing game. Gibbs will take the Swift role, so Montgomery loses a little steam in PPR leagues, but not nearly enough to be forgotten about.
2023 Bottom Line
Detroit should be very potent on offense this season and should move the ball well on the ground. There should be more than enough work even with Gibbs around the make Montgomery fantasy-viable. He'll be a stable RB2 this season for fantasy purposes and for a good price in the 7th round,