I actually see it this way, and to me it makes the most sense. They get ambrose first, and there will be a backstage segment to see who goes when. Ambrose will lose, and will hang around, before somehow costing rollins the win. They fight outside the cage, leaving Reigns in with all 3 members of the shield intact. It probably wont go this way, because Rowan isnt great at all, but Harper could very well pull it off.
IDK how it happens, but Bray vs a busted down and beat up Reigns will make sense, they can have a beast match still, with Wyatt being 1 step ahead of him, maybe even playing him psychologically with the lights going out or a weapon of some sort being implimented. Reigns will look strong as hell, but Wyatt is the one getting the pin, that much I am certain of.
I think that is the best part about it all, we know who is going to win. It's how it gets there that is going to be so damn great to watch.