>>534567007
It's because Oguri cap isn't a great protagonist and everyone around her has to do double the work and give her purpose because she just wants to run. She never really knew where she wanted to run too or have a purpose until she got a trainer. She's just a really good race horse so her faults have to be within her personality and as a character. She can't be a Jungle pocket who has lots of personality but is a struggler. Because these are based on real races.
So all of Cinderella's Grays writing are going into the people the Cap has to compete against. That's why people are so attached the original horse girls they created.