5 stars!
One epic moment in which Obito and Kakashi got their MS together, i called it.
not sayin i was first, but i called it
and it didn't take kakashi 10 to 15 years or whatsoever to master it.
we simply dindn't see him use it.
doesn't mean he couldn't have had it as some kind of last resort.
but it was not necessary from his point to activate it at any moment in the fights
before he revealed his MS to itachi/fighting akatsuki.
could be called arrogance, but i think he was sure to win without it,
so the revelation was pretty much delayed to us poor readers ;-)
and i think we didn't really see it in his fight agains itachi, coz
honestly i think that fight did not start for real before it was ended.
i think i remember itachi/kisame retreated.
and u dont show and perhaps overuse your best attack in the first clash.