The issue here is the post-facto rulings went opposite the "field of play" rulings.
So given the court precident it could certainly prevail as a legal arguement.
The likely "result" would be a reversal of the post-facto ruling with no monetary compensation, even for costs.
What is truly sad is at NAR, the "Contest Board" is consistently and historically "arbitrary and unfair" in its rulings (not unlike TRA and membership removals and motor vendor lynches), that one cannot ever expect a fair or reasonable ruling from "on high" so the FIRST instinct is to look to a higher power charged with being fair on SOME level (not perfect either).
My experience as a long-time contest host is CB rulings went AGAINST the written rules more than 70% of the time.
This indicates it is ego driven, not fact driven.
Jerry