Scarborough is not the answer at RB at all. The Lions need a durable option and Kerryon is a good rotation with McKissic a good 3rd down option. Ty is worthless as he has no wiggle at all.
Ratings are nonsense. I grade RB’s on what they achieve in the opportunity they have on each run. Top RB’s constantly surprise you on how many yards they get with the blocking available and that is the only test that matters.