JJ said he had a tire going down.
Given what happened prior, that’s not hard to believe.
Yes, I read that’s what J.J. said. Kenseth says J.J. was still going full throttle when the 48 slid up into him. It does stand to reason that he had a flat. K.K. also had one during that last caution which, fortunately, didn’t cost him as they called the race.