I don't think that Ryuu's being a coward or anything.
He was handing Kai the rope to see if he would actually commit suicide, just like how Kai sought to push others into suicide.
If Kai were to commit suicide, it would be ironic.
If not, he just ends up being a psychopath anyways.
I get why
@Kendama thinks that way regarding of the situation, as he also worked on Destroy and Revolution, which on itself is a piece of garbage. Maybe he was just too damn tired of having to read bs constantly.
In any case, everyone is entitled to their own opinion, regardless of what it may be.