Goose and Teixeira are the only two near the top that Jones hasn't beaten the shit out of at this point.
I don't think it's a "what's fair" thing as much as it's a "WTF do we do here" thing.
Cormier has demonstrated that he's a legitimate HW threat, there's "beef" for those looking for it, there's a storyline for either fighter, and it's far more intriguing than seeing Jones beat the shit out any of those other guys IMO.
Honestly, though, I'd think DC would at least want a test fight at 205 before fighting Jones anyway. I'd hope they would put him in there with Feijao or Te Huna or someone he would spectacularly destroy.
And the piano, it sounds like a carnival
And the microphone smells like a beer