Re: The Kakashi in Chapter 604 has no headband. So he's a zetsu clone?
Why is everybody seem interested of that particular page.
A single page cannot tell you anything, review the WHOLE Chapter.
Page 16 show image of Rin becoming clearer to Obito.
Then page 17 show the whole image of Rin and something that touch Rin left side.
Page 19 showing Obito's right eye. And Kakashi left eye, which is not covered.
Kakashi's left eye belong to the owner - Obito. That is why Obito can see what is happening.
(Kishi:- Naruto Still Has More Surprises Left, Will Last Longer Than Expected)