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This page has been speculated rescently in that some people beleive that because they are both Obito's eyes in Tobi and Kakashi - Tobi couldnt use S/T to dodge Naruto...
I beleive this is wrong...
Firstly Tobi already stated that using Kamui on him is useless...for one reason or another (unbeknownst to us)...
but we already know that Tobi has to rematerialise in order to actually do anything in the world...whenever he is intangible he is almost literally a 'ghost' - in that he cant enact on anything until he is tangible again...
This is why Tobi dodged naruto's attack - he was protecting the Mazo from Kakashi's Kamui...NOT because he couldnt use his S/T whilst Kakashi is using his Kamui and had to be tangible to do so
...just thought id clear that up, and hopefully people will understand that better