The fact is any company can do whatever they want, whenever they want. If you have stuck to your side if the bargain, and the other side do not supply what they are contractually bound to do, then your remedy is to be found in the civil courts. Unboarded, deplaned, evicted, denied boarding it doesn't matter. So whether the positioning crew were late, no charge rebates, top priority - must fly is irrelevant. Someone somewhere decided this man had to get off. His status, rights and entitlement changed as soon as that decision was made. It is just a shame that some believe he had an absolute human right to insist that he was taken on that flight. That has never, ever been how this part of the world works.