User blog comment:DestructiveMilkshake/Total Drama Presents: The Ridonculous Race Speculation/@comment-24971793-20140720195959

I think Katie & Sadie will come back, and be the first eliminated. Just like in TDI they start fighting, loose focus, go completely of track and arrive last (or not). Like they did plenty of times in TDI. They would be the perfect first elimination fodder.

Besides the couples you already mentioned I would say:

From second gen Jo & Lightning (likely), Dakota & Sam (maybe) or Mike & Zoey (unfortunately likely because they're screenhogs).

3rd gen Max & Scarlett (likely), twins (maybe), Dave & Sky (maybe)