Ambrose is there to eat the pinfall. Don't see why Orton can't be the one to do it (especially since Orton has shown he has no issue doing jobs for people, clean or otherwise), but I guess they want to keep his momentum as a babyface going as much as possible before likely jobbing him to Bray Wyatt at Summerslam (at least I'm hoping, anyway.) Either way, I'm just happy to see Dean Ambrose in a WWE Championship match on a PPV.
Plus, it was reported by the dirtsheets that since Seth Rollins vs Brock Lesnar vs Roman Reigns is the planned main event for Summerslam (just as we all figured it would be), they don't want to have so many triple-threat matches within such a short time interval of each other. To date, we've already one at the Rumble, technically one at Wrestlemania although it lasted for about all of a minute, and now we supposedly have one coming up at Summerslam. Booking one for Payback as well (which would have featured two-thirds of the same match we're gonna see headline Summerslam) would have felt a bit like overkill.
I personally hope they end up adding one or two more people to the match and making it a six-pack challenge or something. I could see Kane deciding to add himself on the go-home Raw next or something. And if he really wants to be a troll, he could book Big Show in the match too, just to see if it causes some dissension between he and Seth since Big Show may decide to go into business for himself and win the championship again, should he be presented with the opportunity. Kane trying to turn members of The Authority against one another would further feed into his impending face turn. Besides, I don't see who else Big Show could fight (unless his only role at the PPV is to play the bodyguard and muscle and ensure Rollins walks out the champion no matter what), and I don't see him being left off the PPV completely.
