I read up Fade's advice a few times DB, sounds very solid, make sure you follow every step. I am going to look up older posts by Fade at some point, I am certain to learn things with his posts.
The WAS will never tell you truly what they want, it is just a terror tactic, trying to hurt you with words to instill fear in you to get something they want. You wouldnt know how serious she is with custody until you actually sit down with her to negotiate mediation or work thru lawyers. If she knows it will hurt you to instill thoughts of losing S then she is going to use it. Remember they are the other half of us who knows us the best, they also know which nerve to pinch to cause the worst pain. Stay strong, as time passes you will know what she really wants