It's an arbitrary time period that doesn't get the benefit of removing years. Even so, I think a legitimate claim can be made for all 3 of them. JJ's goat career legacy is still etched in stone. The numbers don't lie for KB he has the most wins of the decade in less races due to fractured leg. He's a late bloomer prime years starting in 2015, 5 consecutive final 4's made, while still possessing strong overall performance early in the decade. No years without wins. Harvick's claim can be built on superb consistency combined with multiple years of dominating the field. Again no winless years in the decade. JJ's biggest claim is clutch championships, and early decade overall performance from 2010-2013. His ability to deliver wins in high pressure moments is unmatched. I find it interesting that all 3 have tracks that they were/are heavily favorited, it seems a prerequisite for greatness. KB (Bristol, Richmond) Harvick (Phoenix, Atlanta) Jimmie (Martinsville, Dover).