India, May 22 -- The death of Kyle Busch has sent shockwaves through the NASCAR world and perhaps no one felt it more personally than his longtime teammate and rival, Denny Hamlin. The two men shared years together at Joe Gibbs Racing, pushed each other to be better, clashed publicly and never stopped talking about one another.

When news of Busch's passing broke, Hamlin turned to social media to express his grief. "Absolutely cannot comprehend this news," he posted. "We just need to think of his family during this time. We love you KB"

The two men had spent years racing alongside each other at Joe Gibbs Racing, where they were widely regarded as 1A and 1B at the top of the organization, swapping that top spot back and forth depending on...