Ultraman's Main Suit Actor Hideyoshi Iwata had tweeted that he is going to appear in Kamen Rider Saber from Episode 16! Could he be playing Kamen Rider Saikou?
Even official JAE Website hasn't listed any new suit actor in the list for Kamen Rider Saber Episode 16. So there is a high chance of his being the suit actor Kamen Rider Saikou.