I was going to add while Williams was nice find, and was good overall as a runner, the NFL has shifted to RBs that can add more in the passing game as well.
Gone are the days where RB's would just run the rock.
CMC finished a handful of yards ahead of Williams rushing wise, but dwarfed him in total yards as he had 900+ receiving yards compared to 177 for J-Will.
Gibbs not only split the load but had ~650+ receiving yards too.
Obviously, there's a talent gap between J-Will and the two above, but just pointing out, as you know, that 9th sounds good on paper but quite a few other backs that are considered very good are dual threat.
Williams is more of a runner only.