1. We know a demon can be sealed into things.
Sealed into Ninjas
the Shukaku was sealed within a tea kettle
the 8 tails was sealed within one of the SO6P items
one of the Gold and Silver brothers was also sealed within the SO6P items
Yet we do not know about the sword, most likely yes though.
2. The Kyuubi chakra can break at least some seals and shadow imatations.
So can he do it to something like Itachi's Sword?
3. Also we know that demon's can split/break apart their body and live.
Sage of Six Paths split the Juubi into 9 Demon and they live, and if they die they will returned just takes time.
It has happened Killer B tranformed himself into a tenacled and Sasuke used his chidori sword to cut him free.
Also when the Kyubi chakra was split into 2 and he lived.
Both were by someone else but if they manage to split away from the sealing they might get away.
Sealed into Ninjas
the Shukaku was sealed within a tea kettle
the 8 tails was sealed within one of the SO6P items
one of the Gold and Silver brothers was also sealed within the SO6P items
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Yet we do not know about the sword, most likely yes though.
2. The Kyuubi chakra can break at least some seals and shadow imatations.
You must be registered for see links
So can he do it to something like Itachi's Sword?
3. Also we know that demon's can split/break apart their body and live.
Sage of Six Paths split the Juubi into 9 Demon and they live, and if they die they will returned just takes time.
It has happened Killer B tranformed himself into a tenacled and Sasuke used his chidori sword to cut him free.
Also when the Kyubi chakra was split into 2 and he lived.
Both were by someone else but if they manage to split away from the sealing they might get away.