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I think in some ways, boxing is the closest comparison to motocross. it's not a motorsport so much as an individual sport. 2:00 - 2:27 says it well. McGrath is the one guy who did both; he was the best in technique (in terms of moving the needle) and also the best in statistics (and Supercross reigns)... Bradshaw also deserves more accolades on the scale they outline in the video, for example. nevertheless, I look to boxing as the cousin comparison, because other motorsports are so vastly different than MX, those comparisons are hard to find.