I just realized this manga is very history accurate even with these trainer role.

In this manga, King Halo Trainer not her trainer anymore, instead is Zephyr's Trainer. meanwhile king halo trainer give some guidance to Divine Light.

In RL, King halo first jockey, Yuiichi rode Divine Light, while Y.Shibata who usual jockey for Zephyr rode King halo in Takamatsunomiya Kinen 2000