India, May 27 -- Brad Keselowski has revealed that Kyle Busch was not in his usual form in the days leading up to the tragic passing of the NASCAR legend, and the two competitors never had the opportunity to resolve their differences.

Busch passed away at the age of 41 on Thursday after a severe case of pneumonia quickly progressed to sepsis. The racing legend was set to participate in the Coca-Cola 600 in Charlotte, but the Cup Series event was ultimately converted into a tribute for Busch.

Keselowski and Busch had a heated NASCAR rivalry that lasted for several decades, and although there was mutual respect, the two were well-known for their conflicts. Keselowski had hoped to eventually move past their on-track confrontations, but Bus...