Love the first pic w/Grace
Looks like play, JD might just be a bit rough with his play, like he was with the dogs when you first got him. From what you've described Dusty just isn't telling him off sternly enough for him to back off.
I think JD is comfortable with Dusty in his house otherwise he wouldn't be grooming while she's that close watching him.
The pic with JD leaping from behind Dusty in front of the tunnel - that's play if he was attacking his ears would be back.
The last pic is what Lilly & Pixi look like at the beginning of their tussles, the ears are back & the eyes are closed just to protect them.