As close as the racing is, and with the slow pit road speed limit, if Dale Jr. were to pit to fix the handling, he would go one, if not two laps down, effectively ending his chances. He did the right thing by trying to stay out until a yellow or a scheduled stop. He has to learn how to race a Cup car that is not handling properly. It looks like the car just got away from him.
As for DW, apparently, he just parked it and walked away. Check out
www.speedvision.com/racing or
www.jayski.com for more about it. Seems like quite a story developing there.