Shoot Boxing is here to save RIZIN with ready to go stars. KAITO is going for 4 fights in 4 months. He won back in June, last week, now this and Shoot Boxing main event next month. Taiki Naito is another Shoot Boxing champ, only loss the last few years was when he tried to win the title in the division above. Okuyama is another solid young guy.
Sho Ogawa is a former REBELS, WBC Japan, and K-1 Koshien champ.
Hannya is probably the lesser of the bunch. Fought in Ganryujima last year and has fought for HEAT, GLADIATOR (former champ), and recently dipped his toes into Lethwei.
These 2 fights definitely gave the event a bit more oomph to the event for me just for the Shoot Boxing champs being included.