So I've been thinking, in the off chance this actually happens, I think Taker will interfere in the ending of Cena v Styles, costing Cena the win and setting up their inevitable match at Wrestlemania 33. And hopefully as a result, a mini feud starts (maybe a match somewhere, but don't let it end cleanly), and somewhere in October Cena is put on the shelf by Taker, giving Cena time off, probably to film something. And it sets up itself perfectly, Cena returns in a Battle Royal in January to determine who faces Taker in his last match (yes, they announce it) and wins it. Then start the intense build up between the two of them. And maybe at Mania, Cena turns heel or somewhere in the lead up to it, but yeah. It writes itself really.
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I want Styles to go over clean, but Cena losing clean, whilst it's happening more often now, barely happens enough. But for the sake of a storyline, it makes sense for once.
Maybe have Taker come out at the end of the match to go face to face with Cena instead? There's so many possibilities and hopefully WWE doesn't waste it. 
It depends on what WWE thinks would sell more tickets. I still think Hulk Hogan vs The Rock should've main event X-8 instead Triple H and Chris Jericho.
I can see it being multiple ways. Either it was planned, which would explain why there were two medical members there immediately. There's almost always just one near the bell keeper. And if it were a shoot, then Shane likely wouldn't have come out. But, if it was a mistake then there had to have been a lot of coordination which is why it took longer than expected for the giant crew to come out because they likely weren't expecting it. And Brock going off isn't too unimaginable because that spike DDT he took was stiff as hell.
