Board Thread:Theories and Speculation/@comment-29332822-20170111104029/@comment-734582-20170116085241

UntappedRage wrote: Unless you want to imply Hokage Naruto's SPSM enhanced Kurama cloak is weaker than his old rage induced Four Tailed V2 form.

So by this logic, Kishimoto just forgot, like how he forgot to give Boruto the Byakugan. Or sasuke improved upon the sword. They did destroy each other's arms, while unable to heal it. And someone at some point must've forged these special weapons like Kusanagi. So i don't see why Sasuke can't have made a Kusanagi that can pierce even through chakra shrouds, especially if it's a metal like Asuma's weapon and the jutsu imprinted is Preta.

Simply put, it's not outside Sasuke's abilities to have a chakra-shroud piercing sword. In fact, considering the people he dealt with, it would be stupid if he didn't have such a sword.