This is what I'm saying. Nobody has any explanation as to how the blade was able to pierce Naruto, which is why I said that the blade was subject to some form of telekinesis, which at this point all the portrayal points towards. However, even with this hypothetical power, I highly doubt that it would be possible for the sword to gain sufficient momentum to pierce Naruto in any case without the aid of enhancement. There are no known techniques that are capable of improving the functionality of weaponry without some kind of visible indication, which is why I'm sceptical of this whole "enhanced weaponry" explanation. Both arguments are at best inconclusive anyway, there is no proof that either your or my explanation is correct or vice versa.