Gus is a bad stylistic match-up for both of them. The key things here being speed and movement, which Gus is very quick and uses his movement a ton. Like Machida, he has both of these advantages over just about every opponent he'll face in his division. Speed kills and movement helps with avoiding his opponent's offense and them getting takedowns. If he couldn't move as well as he does (being so fleet of foot) and didn't have the quickness and reflexes then he wouldn't be such a bad stylistic match-up for both Jon and DC.
When you add in his boxing ability, excellent TDD and overall striking on top of his speed, reflexes and movement it makes it hellish for his opponents to deal with. Not to compare him to guys like Ali or Sugar Ray Leonard, but both of these guys had speed, great reflexes and movement too in spades and when they used them fully they were very hard to deal with. This isn't anything new.
Gus already proved that he isn't a good match-up for Jon due to these aforementioned attributes. Against DC, don't expect them to disappear and not matter. They will. It comes down to whether or not Jon or DC can walk him down and cut off the cage which won't be easy against a guy as quick on his feet as Gustafsson.
McGregor, Edgar, Gunnar, J-Lau, Penn, GSP, Rory, Condit, Weidman, Franklin, Mousasi, Chael, Gustafsson, Phil Davis, Shogun, Cain, Travis Browne, Fedor
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