AFC South report card | NFC South report card | Conor Orr’s post-draft power rankings Was last season a blip or an inflection point? That’s the lingering question for the AFC West.  After winning the division for nine consecutive years, the Chiefs posted a 6–11 record, finishing third in the West. As a response, Kansas City was aggressive, shoring up both sides of the ball, led by the free-agent signing of Kenneth Walker III and a pair of first-round, defensive draft picks.  Then there’s the Raiders, who have a new coach-quarterback combination in former Seahawks offensive coordinator Klint Kubiak and Heisman Trophy winner Fernando Mendoza . While the climb from the basement to the penthouse is steep, that combo is the ticket to making a strong move.  But we begin with the Broncos, who are hoping to hold onto their newfound perch atop the division.…