The thing with this 'ringer' issue is the rules have always been the same, they're not allowed to have any ballroom dancing background/training.
Throughout the whole time its been on (and i've been watching it from the first season) there have been celebs on there that went to theatre school, did ballet, tap, some commercial, or theatre dance... i just feel that of late, people have got more and more pissy about it, and there is no need.
Debbie McGee spoke about the fact that her background in ballet gave her flexibility and the understanding of dedication to learning dances, but the discipline of Ballroom/Latin was completely alien.