Quote Originally Posted by Abdula
His arm works fine after taking over a new body because that person's soul is in there too or rather Oro eats that person's soul, and no I'm not kidding. Anyway like I said before there was nothing wrong with his arms that part of his soul was just sealed. If it was as simple as attaching some new arms Kabuto would have done it.
Then why did Orochimaru believed so strongly that tsunade could heal his arms? The ability to heal a soul with healing jutsu seems a little farfetched.

Isn't it possible that Kakusu's kinjutsu would work but that option wasn't on the table anymore since Oro had already betrayed Akatsuki?