I should perhaps have mentiond that we here in Sweden play under a special Swedish ruling called the "SweFAQ", which currently enables us to have characters on rippers/terradons join units of rippers and terradons respectivly. They perform special rulings sometimes for rules they find are rather obviously intended in one way, but due to a loop hole are prohibited (much like this one), or perform rulings on contriversal rules which GW have yet released a FAQ on, so as to make tournaments more streamlined and without arguments concerning rule intepretation.