>>18062302
>Daisuke Sekimoto was diagnosed with a traumatic cervical spine injury, but without paralysis or muscle weakness. The grade of the cervical spine injury is considered low and is similar to a concussion
>After discussion between the doctor, Sekimoto himself and BJW president Eiji Tosaka, it has been decided that an additional examination will be conducted in two weeks to check the degree of the recovery of the cervical spine and a decision will be made at that time.

I guess he left to become freelancer because he can manage his schedule and wrestler whenever he can (and wants).