At the moment, JDS' take down defense is just like how Machida's TDD was hyped up before he fought Jon Jones, or an elite level wrestler who's game plan was to take him down. (Note, Rashad Evans wasn't committed to taking the fight to the ground).
JDS' TDD still hasn't really been tested from a truly elite level wrestler, just like Machidas hadn't before he fought Jon.
Jon Jones scooped up Machida like he was a toy and dumped him onto his ass. That's the calibre of wrestler Jon Jones is. Dos Santos isn't on this kids level. Bulked up, Jon would toss Junior to the floor and brutalise him with elbows.