You're right about the economy of bodies issue: he didn't think it necessary since the rest of us were going with D. But, therein lies his weakness: he doesn't get that his D's feelings should have over-ridden that! It's much like the fact that he doesn't get that my needs have been ignored every time he sees no use for me to feel the way I do about something. Yet, right now, all that he is going by are HIS feelings. None of that probably makes sense, lol. Bottom line: everyone else's feelings are ignored if he doesn't agree with them yet his scream out right now and are the only thing he is listening to, whether they are logic and reasonable or not.
I like the idea of getting to him with his own "speak" though. Maybe that will work since nothing else really does right now. If he can relate to it, maybe it'll be more effective.