While I never had a trainer or assistant show a horse for me, I have worked with trainers who had assistants. Because at the time, the horse in training was being specifically trained for my grand daughter to use in 4-H, I thought the best use of my $ was to have the assistant (small college student) ride the horse under her dad (the trainer) supervision. The trainer was a big man. My thinking was that the assistant would ride more like my 10 year old (tall but weedy) grand daughter.
The assistant eventually went on to win just about every college award there was in Western Riding and did World and Congress many times riding her own horses and her dad’s client horses.
Granddaughter did her 10 years in 4-H and never rode again (I was sad, but understood horses were my passion, not hers. The horse stayed with me until he died this year at 26 of fast growing bone cancer in his jaw).
During the time GD was in 4-H, she and her small unremarkable, unmarked, BSP were never out of the ribbons --usually in the top 5 and occasionally beat the “big dollar horses” in pattern classes. GD worked well with the trainer (she adored him) and the month the horse spent with the trainer and his assistant each winter added more polish every year.
Anyway, that was my thought --put up the rider that rides most like my GD.
And after 10 years, I am currently BACK with the same trainer --his daughter as long moved on, but his new assistant (of 7 years) is a tall slender young woman (I’m a tall skinny old woman). Guess which is riding my horse when he’s doing his month at the trainers in April when I am out of the US? Yep, the assistant --because she rides like me! Currently we take monthly lessons-- I haul in --and then Bob and I practice what she assigns until the next lesson. Occasionally the head trainer comes and watches and makes suggestions to her or explains something to me (his latest one is that I need to be more patient and WAIT for Bob to give me the correct response) --anyway --that’s my thoughts on who rides my horse!