NASCAR on NBC analyst Dale Jarrett on William Byron’s emergence as the “new age” NASCAR championship contender who hones his craft on data, iRacing and simulation; how Byron also is a throwback to how DJ started in racing; should NASCAR reconsider having stage break yellow flags on road courses?; potential track limits for Watkins Glen; the ideal length of time for a Cup race; has the Next Gen become too drivable at road courses and should NASCAR add horsepower; what went wrong with Chase Elliott’s fuel strategy and was it the result of playoff pressure?; the impact of Hendrick possibly missing its two biggest sponsors in the playoffs; previewing Daytona for Chase; DJ’s Championship 4 favorites.