Michelle McCool
Michelle McCool has three things in her favour when it comes to her relationship with the WWE. The first is that of the 'Divas' Era', she was one of few women who was actually good in the ring. There were others too, but she was certainly one of the better performers.
Another factor is that she left on good terms and will always be welcomed back. That netted her a spot in last year's Rumble match - while she also recently stated that she'd love to come back and chase the Women's Tag Team titles.
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The third factor is that she is married to the Undertaker, quite possibly Vince McMahon's favorite superstar of all-time. 'Taker has been the most loyal of WWE employees and Mr. McMahon has shown him the same respect and loyalty.
Add all those factors together and it wouldn't be a surprise to see one of the members of LayCool returning tomorrow for another Rumble appearance.