The Alvarez situation was completely different from the couture situation. Alvarez had fought out his contract. Bjorn publically said he would make one last offer to eddie and then let leave. Eddie then turned down the offer and signed with the Ufc. Bjorn decided to match after he publically said he wouldn't.
Couture tried to leave the ufc while under contract.
"If a man with no arms and a man with no legs started learning karate, the same light bulb would appear over every head in Japan. That’s right: Glue them together and see if it can kill a panda."