Welcome to Mood Swings presented by Landmark Lincoln — your new favorite sports therapy show. This season is proving something we’ve heard forever: defense wins championships. The league entered the year crowning elite QBs and explosive offenses, yet teams like the Chiefs, Bengals, Ravens, and Cowboys have all been held back by defensive lapses. Meanwhile, the teams built on defense — Texans, Broncos, Packers, Seahawks, Patriots — are thriving. With the Seahawks best positioned in the NFC and the Broncos peaking offensively at the right time, the playoff picture is shifting fast. For Denver, the big question is the Joker role. Is Marvin Mims the secret weapon Sean Payton has been saving for January? A two-time Pro Bowler scoring as a runner, receiver, and returner, his touches are trending up at the perfect time. Or is rookie RJ Harvey the real answer, coming off a 100-yard, TD performance and historic rookie production that’s putting him in rare company. Plus: – Are the Nuggets off...