Well, given the similarity to what happened at WM31, hopefully they'll avoid using that ending.
Even those he's the presumed underdog in the 4-way, the story of this match is Dean Ambrose. We already know what Randy, Roman & Seth are doing.....but the black marble is Dean.....which pretty much fits in with his character, doesn't it?
Yes, Ambrose will likely be the factor that determines how the match will turn out, but I presume he won't be walking out as world champion.
How cool would it be for him to Dirty Deeds Orton, leading into the Seth Rollins pin for the win, while Ambrose walks out? That opens Ambrose and Orton through the summer, leaving Rollins and Reigns to run a summer program, before Brock returns to fight for his belt. It fits the Ambrose character, where he just does insane stuff with no apparent motive, etc.