Love the reference there for Kitahara having Daiwa Scarlet and Buena Vista as his trainees. He's also a stand in for Oguri's jockey on Kasamatsu Katsumi Ando which was the one who studied hard to be Oguri's jockey for JRA central. Also Belno being his assistant, similar to how Belno was Roppei's assistant before is a nice touch.
Unfortunately he got his license too late and Oguri already retired, though in this manga he managed to be Oguri's trainer one more time before she retired. He made a name for himself as Daiwa Scarlet's only jockey after he got his license, so pairing him with Daiwa is perfect. He also was Buena Vista's jockey another notable uma on his team.
I guess Oguri's like Rudolf now? Similar to Tama, just chilling in Tracen as a senpai I guess lol. Is tracen also a retirement home for racers lol.