What happened: Kenneth Walker III has thrived in Kansas City after the Chiefs offered him the opportunity to carry a heavier backfield workload, per Jeremy Fowler, Brady Henderson and Nate Taylor. Durability history also factored into Seattle letting the running back depart rather than committing to a featured role.

Why it matters: The move has paid immediate dividends for Kansas City, where front-office executives have praised Walker's contract as a ceiling-raising addition for the offense. Meanwhile, Seattle's ground game has struggled to replace his production since his departure.

What to watch: Seattle will get a direct look at its former lead back when the Seahawks and Chiefs meet on the upcoming regular-season schedule.