So it was Kougane that first started the war between the Femushinmu? Lapis said that the Femushinmu started fighting each other after Kougane is born, and even though he have been sealed, the Femishinmu keep on fighting until they're extinct.
The movire Riders doesn't leave an impact to me. Kamuro and Kurokage Shin only appear for a small amount of time, and Malus is not really that powerful as Kouta in Kachidoki can actually beat him.
I wonder why Takatora suddenly have a wife in this dream world. Maybe because Lapis think Takatora is the equivalent of Roshuo, and that Roshuo's motivation to fight is his wife. Also, Takatora attack Sid because Sid betray him, does it ever been explained what betrayal that Sid do?