"There is no new Kyle. That's just a complete myth," Hamlin laughed Friday at Darlington Raceway.
Busch touted a "new Kyle" following last Saturday's victory at Richmond. Because he remained calm when his dominant car briefly faded midway through the race, Busch said that was an indicator of how much he's changed.
"For the old Kyle Busch, he would have folded," Busch said after snapping a 21-race winless streak dating back to last season.
"The new one, he stuck in there, he dug hard. He kept going."
Hamlin, in his third season as teammate to Busch at JGR, believes Busch is only a changed man after victories. A perfect example was when a late caution cost Busch a victory last month at Phoenix. Busch responded with an angry rant over his radio, was aggressive as he drove through the garage, and Fox executives said he was rude in declining a post-race interview.
"I think you all need to look back in your stories over the last two years and every time he wins you all say, 'It's the new Kyle' and whenever he loses you say 'It's the same ol' Kyle,' " Hamlin said. " I think we only hear about it when he wins."
Busch may have proved that theory himself when he began his weekly interview session clearly in a sour mood after wrecking his Cup car Friday. He scraped it in practice, kept it for qualifying, but was forced into a backup after he hit the wall on his second qualifying lap.
Asked in that moment of frustration about Hamlin's assessment, Busch didn't agree.
"There you have it," he said. "I think I proved my point walking up to you."
Busch, one of the most talented young drivers in NASCAR, has been criticized for unraveling when his car isn't performing well and a lack of professionalism following races he doesn't win -- behavior Hamlin enjoys watching as a JGR insider.
"Half of my entertainment in this sport comes from Kyle Busch, so I love having him as a teammate," Hamlin said.
Although Busch's older brother initially declined to be pulled into the "new Kyle" debate, Kurt Busch eventually admitted he's seen a maturity this season. Kurt Busch attributed the changes to his brother getting engaged, starting a Truck Series team and turning 24 on Sunday.
"Those things that happen to you in life make you grow up a little quicker," Kurt Busch said. "I'm happy for him. He's still going to continue to charge hard. He's going to go after those wins. You just can't write that was, 'Hey, a good Kyle Busch or bad Kyle Busch' when things happen. The things that you get to write are that he's going through life changes and he's maturing. He's not 22 years old anymore."