Does Undertaker have any motive or reason at all to help Bret finishing his business with Vince and Michaels?

Personally? Veteran talent knows to stay clear of someone's drama....it doesn't end well if sides are taken in another person's war with management. Professionally? He'll complete the script with the professionalism that has made him a lifer with the company. As I said before, I could see a WM screw-job with Vince defeating Taker on a fast-count by special ref Hart; but whatever happens, Mean Mark will do what's best for WWE.