Kurt was the fastest car on the track for most of that green-flag run. He's more likely to crash in the closing laps than he is to win, especially given that he had to pit twice, but his pace is still impressive.
I heavily doubt that Clint will steal the championship. Keselowski isn't going to wreck so easily and Bowyer is too far back. Johnson is Bad Brad's closest competition and he's over 20 points back.