Hey, NC. Sorry to hear of this. Why do you think your X would be so gung-ho about C for your S5 and then seem to drop it all of a sudden? Strange.
I think it HIGHLY inappropriate that the C would be lecturing you about not accepting OM as your son's other father! He is not your son's father, and never will be. You should be civil to him, but I don't think anything more than that is needed. Ridiculous! I think taking a wait and see approach about C sounds good, and if your S5 does seem to need C, I would look for a different C than that one. What do you think of it all?