What's the point of having your cake, if you can't even eat it?
Meaning, Athos' Current Claim has been apart of his wikia, for however long it's been there, and generally hasn't been jammed up in any sort of way. Like he said, he's offered it up to the scrutinizing eyes of the participants and it's been okay'd. In all intents and purposes, it's not apart of the Universal Void List that has been established and agreed upon by said participants. And naturally, again, it was accepted last turn with absolutely no type of resistance, but now that he's ready to go through with it, there's a whoa nelly, rein pull? That's not how things are supposed to be. Kamui, more than sure, a former Jink and current if we go through alts, should have known that it was a TBB being charged up. So, as a Council Member, Global Moderator, SL Staff Member, and a prominent member on the actual wiki... damn that's some resume (totes jelly), well, he just should have filed his stop after the last post.
The rule should be for after Mastery is achieved and actively using a lot of the Biju's chakra to use it. Or, I guess, Athos can just consider the Rasenshuriken as just a very condensed and powerful version of itself, since one was modeled after the other. Instead of it being a TBB, it can just have all the chakra in it to be a bastardized version of it with about 75% of its destruction properties intact. That's how I'd change things.
P.S. Is the Space-Time Cancellation Barrier down? I don't remember that ever happening?