Word is WWE told these key people that some of the finishes to matches would be changed at the last minute so as to prevent leaks. But when the matches in question actually occurred, the finishes in question were the same as had been planned.
Dolphins1925, the Reddit user who's correctly leaked most 2013 WWE pay-per-view results, said his/her source indicated only a few key people in the company were privy to SummerSlam's match results. It's possible Dolphins1925's source is one of these key people.
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Source(s):
AJ Lee's Twitter (poster)
Dolphins1925
F4WOnline.com