As ETE says, he makes an interesting match-up for JDS. If that fight goes to ground, it would probably be the champ taking it there. And the style and power of both guys means you should have them engaging and somebody getting knocked out.
Hendo is another interesting match up. His best chance against Dos Santos would be to grapple, control, and score points with calculated barrages from top control. But Hendo is Hendo so Hendo is gonna Hendo. That means he probably stands up and looks to land a big H-Bomb to end it. If that fight happened and he won, it would kinda throw the whole division for a loop - he's a guy who can fight at MW.