I'm not a Freddy/Kendra fan at. all. Chip and Kim were sweet, didn't mind them winning over freaking Colin/Christie, but would much rather have seen Kami/Karli (such a hot mess, loved them), or the bowling moms take that season.
Uchenna/Joyce? Nice people, happy they beat Rob/Amber, not particularly exciting. Not to mention how pissed I was when the boring hybrid team of Eric/Danielle beat out the hilarious ChaChaChas and Beauties in first All-Stars.
IMO, a lot of the winners for me are bland and/or annoying and boring.
I wouldn't really be excited to see all of them race again tbh
Loved the teams you mentioned, I agree, a lot of winners I wouldn't want to see back, which is why I would rather see this kind of show as a "Summer Series" in between regular TAR seasons (hard logistically, but they have no shortage of money for this show nowadays to have a backup host/camera crew travel with the winners during an off-month for the rest.) That way it isn't groan inducing to waste a regular season on them and just kind of an "oh, this is fun to watch while I wait for the next season.."
If I had to choose, I'd go with...
Ernie/Cindy (one of my FAVORITE champs, such a funny couple)
Rachel/Dave (just to see how they'd do against the past champs/easily the villains of the season)
TK/Rachel (Still together?)
Chris/Alex (Older dudes by now surely, but I feel like if any real early team would do it, they would.)
Nat/Kat (love these ladies!)
And as a last team/fun twist, two of the 4 Linz family kids? But if not, I'd go with Dan/Jordan, I didn't like them in the beginning, but they got more likeable.