But the legal definition is what matters. The organisation is trying to play down claims saying it was actually 'cadet to cadet'; if those very same two individuals were in the ACF, with their ages, they would be Instructor to cadet.
The only mitigating factor is that if it's cadet-to-cadet, the offender probably hasn't had the same degree of safeguarding training as a member of staff. That said, those that wish to offend will do so regardless of the training given to them. That and in the case of cadet-to-cadet, you can't claim a position of trust was involved. However, the older cadet was probably senior in rank, and we all know that those senior ranked cadets are empowered in the eyes of younger cadets, in much the same way as instructors.
I too am troubled by the low percentage of dismissals when compared to others.