Actor Mitsuru Karahashi who you guys might remember as Naoya Kaido / Snake Orphenoch in Kamen Rider 555 and Juzo in Shinkenger has been listed as the Cast of Kamen Rider Saber. His Character name is Hayato Fukamiya. He is the of Father of Kento Fukamiya (Kamen Rider Espada). If you guys have already read the previous article where TV-Asahi had confirmed that Kamen Rider Calibur is Kento's father. Then it would mean only one thing. Mitsuru Karahashi is Kamen Rider Calibur.
By the way, another of his Kamen Rider role. He had also played Musashi Miyamoto in Kamen Rider Ghost.