To be honest, I thought Gus beat Jones. More head strikes in 4/5 rounds. The striking was only close due to leg kicks which shouldn't score as high unless they're significant.
Gus arguably won rounds 2,3 and 4 vs DC as well. On a good night, he can likely beat both guys. I'm not convinced DC or Jones any have more improvement in them than Gus has in him.
The most interesting fight would be at HW because Gus has the biggest frame of the three and might be able to gain a weight advantage.