A long time ago, I theorized Edo Itachi may have placed the weapons inside Naruto by making eye contact with him. This was supported by he not bringing out his full susano'o against Kabuto and not showing if he still had them. I also think it would parallel he transferring his doujutsus to sasuke and my theory that the weapons were made by the Uzumakis. Perhaps with his new power and the Ashura cloak, he will be able to pull them out and fight Madara with them?
he didn't use the spiritual weaps against Kabuto because he didn't wanna kill/seal him, he just wanted to end the edo tensei
he didn't want Saske to burn his ass for that same reason, and the shield wouldn't do any good against white rage, sound genjutsu and such anyway
and Nardo has the ohmaigod balls now anyway, he wouldn't need the shield
If ANYONE has it .. it is Sasuke with Itachi's eyes but Itachi's Wheapons are NOT items they are unique to his Mangekyou and are considered a SPIRITUAL wheapon....
Totsuka and Yata are only for those who inherit the SOLO... so Sasuke MAY be able to use it but Naruto will not until he learns Solo No Jutsu... he is not sealing/onshotting/soloing anyone anytime soon... MangaPhaxz LMFAO
the spiritual weaps are not unique to his MS
he just uses them with his susano'o because he wants to
about the solo part... Nardo and Saske can solo pretty much anyone besides the sages family and Madara at this point xD