They're not looking for one winner, right? Their looking for one winning
pair. With that in mind, all of the eliminations of one woman and one man are fair. If the competition was to be the top single dancer, I would want them to do a final 4 where any of them could get eliminated in any order regardless of gender.
Actually, if it was going to be a single winner, we should have been watching several weeks of solos, with perhaps a few pairs tossed in for variety.
I don't have a problem with it being one man and one woman. And normally I'm the first to advocate for same gender equality!