Hmm... Here's my theory about the contestants
1) From Season 24, Jet and Cord will be the only ones returning for a fourth go, cause Luke and Margie got a second consecutive low finish, and the Globetrotters were too middle-of-the-park. Leo and Jamal will return for a third pop, and so will Brendon and Rachel.
2) From Season 25, it's gotta be Adam and Bethany (who has a biopic! just found out...), and either Brooke and Robbie or Kim and Alli.
3) Haven't watched S26, so I'm going with an old comment and saying Hayley and Blair.
4) From S27, Justin and Diana HAVE TO RETURN. Their dream run was ruined by a whole lotta cab trouble. Tanner and Josh will also return, but Denise and James Earl might too
5) From S28, Brodie and Kurt will return (they remind me of Leo and Jamal). Tyler and Korey will also return, unless they have other stuff to attend to, in which case we will see Sheri and Cole, or maybe even Scott and Blair (#Blodie!) again...
6) From S29, Redmond and Matt are likely to return, cause Redmond has been on CBS before, and Matt has won pro sport events. If Logan and London don't win, they too will return, considering Logan's excitement (Check his IG feed), and London's popularity.
An all-winners season would sound nice, too! Rooting for Matt and Dana on that one!