Did you hear Kenseth? "I'm not going unless there's at least 5 guys lined up, so let me know when there coming and I'll jump in front of them"
He wasn't losing much/any ground to Johnson at that point, so no reason to risk getting freight trained. JR probably would have gone for Mac on the last lap, but then if they hadn't gone Yellow, Everybody might have gone for everybody else as well and they'd have a junkyard sliding across the finish line. (much like the truck race )
i still dont see the warning but that was on me i was away all weekend or i woulda waited till qualifying to put picks in.