*^ I interpreted this part to mean that the whole weapon turns into free-form putty and can be manipulated freely. But it sounds like you mean only the chain can be manipulated like that.
Kijo Sealing Chain
*^ I'm still a bit confused what the fuuin portion of this technique does. I see you clarified that it doesn't prevent the usage of all techniques which is good and clear, but now it seems like all this techniques does is just wrap someone up in Kuri chains. I don't understand where the sealing or fuuin comes in.
They boast a C-rank hardness by default, which is elevated to B-rank if the original weapon has S-rank quality/hardness.
*^ C-Rank hardness/quality