#1 To potentially test their chemistry out
It is not uncommon for WWE Superstars to test out their chemistry before they collide in a pay-per-view match somewhere down the line. A recent example of the same would be when Dolph Ziggler and Shinsuke Nakamura took each other on in several WWE dark matches before they met at WWE Backlash and Nakamura defeated Ziggler.
Ric Flair and Hulk Hogan would also wrestle many times in WWE in the 90s, but wouldn't actually have a pay-per-view match until they went to WCW. The fact of the matter is that sometimes the chemistry clicks and the performers realize that they have something special, while at other times it doesn't and plans thereby change.
Corey Graves deleted his Tweet! More details HERE.
If the two men discover that they can work very well with one another, this is a program that can extend for many months at a stretch. If they instead discover that their matches are duds (you judge for yourself from the video linked right above), WWE could potentially pull out the rug from under their feet and the program could end prematurely, right after Hell in a Cell.
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