Pretty sure Ushimaru is confirmed dead however it’s possible that Ryukogyu is a Shitmotsuki but it’s way too early to say definitively. If he is one though, I have to wonder why he would join the ranks of the world government. Maybe he’s unaware of his heritage or perhaps something else? The bull definitely seems to be some kind of a family crest though and it resembles the logo found on Koushirou’s dojo uniforms. Maybe the swords are meant to represent the bull horns?