Fantasy Upside
Jalen Richard has an above-average offensive line and a head coach who is expected to lean on the running game more in 2018. In limited touches, he's been very efficient, though, averaging more than five yards per carry in two NFL seasons.
Fantasy Downside
Marshawn Lynch is still above Richard on the depth chart, as is Doug Martin. Even if one of those players goes down with an injury, Richard will likely find himself in a running back by committee.
2018 Bottom Line
Richard simply is not fantasy relevant unless Doug Martin and Marshawn Lynch are no longer in the picture, and even then, he'd likely split touches with DeAndre Washington. A path to fantasy-relevant touches just doesn't seem plausible.