>>535484654
Mejiros aren't as big as they used to be. They are like nobility that have waned. They still have their pride though. Although IRL they are huge and have many horses.
https://www.youtube.com/watch?v=ugxOb2wJJ78

Satonos are the Rich (rich with a capital R) group that dominates everything. They play into the all powerful/shady organization. They also have SEGA too apparently. Money is no object considering how much they paid for Satono Diamond.