In a couple show circuits I've shown in there have been a few people riding horses for people that couldn't be there or just showing in that division trying to get by with it. For example, a girl who was a freshman in college and on the riding team was riding in Long Sturrip. Make any kind of sense? Didn't think so. Also, another girl who had moved up to Pony Hunter and won Champion in that division and had been showing well over 4 years rode in a few shows for a kid that was away at school. He won Champion due to her help, not too fair to the Reserve Champion who would have been Champion.
Schooling show or not, you're paying money to show. No matter the level, it should be done fairly.
This keeps happening and the people doing it try to justify or play stupid. Oh and we're the bad guys for bringing it to show management's attention.