Aside from this clause, it is nothing out of the ordinary for Chinese athletes to fight in both promotions. Legend FC hasn't claimed exclusivity of its fighters, although it has previously publicly stated that it does keep its title holders exclusive, Adrian Pang being the exception: he had a contract with CFC predating Legend FC's, and both organizations honored it. RUFF, in its turn, has also written at least one exclusive multi-fight contract, a source close to the matter has confirmed.
Beyond the contractural obligations and legal mumbo jumbo, lies the sport. Beike versus Sayed is a match people have wanted to see, although 'see' is subjective as RUFF neither broadcasts nor streams outside of the China market - fans would be left searching for Youku videos weeks after the event. Mark up the same sentiments for Legend FC, who won't sign Sayed because it focuses on only Austral-Asian athletes.