#1 Making it a Triple-Threat match
This seems like a fantasy match, but there are chances for it to happen. We know WWE doesn't have a guy who's around Shawn's age, adding him to this match will make this so-called Last Time Ever match more special than ever. Adding him to the equation will only freshen-up things.
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If Shawn Michaels is getting ready to make this announcement, then it would be a perfect role for him than just sitting on the sidelines and watching two of his old friends having a match in front of him.
It would be a fantasy come true match, and no matter what happens, or who wins this match, it would be a feast for WWE fans who have wanted it to happen for a long time.