Buffalo: I thought the same thing, that Anon shouldn't have been able to use Kisame's sword, Yuura not be able to do Sharingan. But as Kakashi mentions about the Fireball jutsu, it's a trademark of the Uchiha clan and the one made by the "sacrifice" was the real deal. It makes me think that chakra has some genetic, along with physical and mental aspect to it, since putting Itachi's in Yuura's body gave him Sharingan.
I think it was more the limit on the chakra, only being 30%, that caused "Itachi" to say that he couldn't use Mangekyou Sharingan, hinting that he'd be unable to fight and use that jutsu all at the same time with just under a third of his chakra.