I'm a big fan of DC, he's a great fighter, but beating a 44 year old fighter (in 3 months he'll be this age) that no longer has his testosterone replacement therapy (TRT) who has looked horrible lately and was just finished a couple fights ago (by Vitor) tells us next to nothing about DC. Not to mention that Cormier heavily outweighed him and Hendo was only like 199 lbs. Hendo is not only VERY old but he's very slow, always has been but even more so now, and he's extremely predictable and one-dimensional. Henderson was also getting beaten up by Shogun before he landed a hard punch that broke Shogun's nose badly and dropped him in his last fight. Hendo is far, far removed from his best days as a fighter. He looked absolutely horrible against DC, was tossed around and controlled, but was still able to catch DC in a crucifix momentarily and escape some bad positions on the bottom.
With that said, I believe that DC will need to improve a lot more (with his offensive and defensive striking + footwork) before he'll really be a hard match-up for Jones or Gus. His short limbs don't help and he'll have a huge reach deficit against the both of them. I can see them picking him apart from the outside and a guy like Gus using his footwork and moving around a hell of a lot to avoid getting clinched up and taken down (though I'm sure this will happen eventually). IMO DC beats Jones easier than he does Gus but I'd still favor Gus to beat DC at the moment when they fight. Gus' footwork, striking, speed, power, cardio and size (reach + length) can certainly pose some problems for Cormier.
To answer the thread question, undoubtedly Jones-Gus II. DC will fight the winner for sure and Jon and Alex DO have some unfinished business to tend to. Too many people (myself included) scored it for Gus and believe that Jones actually lost that fight or scored it as a draw even though he got the nod.