That reads like a really good explanation of things. One fuzzy area though was the paragraph "if a contract expressly provides that a player can walk if a team relocates, then the player can walk. That, however, would be highly unlikely."
How would we know if any contract expressly provides that? Are player contracts public record somewhere I don't know about? I've been relying on what others say (that no contract can have such an express 'out clause') yet that blog is asserting it is not impossible, just highly unlikely... makes me wonder 'which is it?'
and if no one actually has such a clause it's kind of a moot point.