Kansas City visits Las Vegas with Johnson 35th among running backs in PFN’s Week 4 rankings, and the case for the rookie is easy to follow: this is the most run-centric Chiefs offense of the Patrick Mahomes era and he is one injury from leading it. Where I get off is the idea that he would be a one-to-one replacement if Kenneth Walker got dinged up, because I would expect this offense to climb right back to a high PROE.