You might have to wait for him to want to come play. I'm not sure what's going on in his mind; but if he is still thinking about the A he may need some more time.
I think you might not want to initiate again anytime soon. Just keep your PMA up. Try some 180s. It seems that giving him time with the kids lifted his spirits so maybe some more of that would help. Obviously, trying to initiate play time didn't; so I would avoid that one for awhile.
Think of some other things that you have done around him that has elicited a positive response and work upon that.
