You do understand the sheer size of a Fully sized Bijuu right?
Cutting of V2 chakra arms is nothing like cutting of a real Bijuu's tail, You think kakashi can cut of all of a bijuu's tails in one thrust of Raikiri?
I do understand it.
Cutting V2 chakra arms is at least an indicator of the cutting ability of the Raiden, which is nothing more than two interconnected Raikiri.
Did I ever say I did think he can sweep the Hachibi's tails off? I indicated that Hell Stab doesn't seem vastly superior to Raikiri, and that a clash between the techniques would be closer than most people seem to think.
If the Raiden can cut multiple chakra arms without givin any indication of nearing its limit, why wouldn't it be able to slice off a few tails? Actual Bijuu-hide is stronger than the V2 shroud, but not excessively so. If the Hachibi was in a disadvantegous position, I don't see why he couldn't, but doing so with the Raikiri is unlikely (it IS a different tech than Hell Stab and doesn't quite have the same cutting edge size). The Raiden, however, seems like it could.