Not sure about that. Right now, I'm not sure I can see any of the four finalists being willing to subject themselves to another grind so soon after leaving the show with the difficulties of the past couple of episodes (Jill/Thomas might be the most 'willing' of the four teams if I had to rank them). Gary and Mallory have had a little extra time to veg out and they likely would be the most willing to do it all over again, especially with Mallory's gung-ho attitude.

I think there's a good bet that we're seeing an all-female winner this year for the first time, but don't think it's the reason why we wouldn't see either Nat/Kat or Brook/Claire in the all-star season as whoever doesn't win would be available to go in a second-chance season.

Just complete speculation pulled out of my heiney, so take it for what it's worth.

As for the question why Season 13 got "ignored" ... I'm surprised that Toni/Dallas isn't back, as I would think they'd be eager to want a second chance after losing the passport and all. I'd bet they were asked back, but declined.