It is one of the mange sharingan's move. THe mange sharingan is basically the ultimate sharingan. There seems to be an emphasis on 3 in the sharingan. So if anything there may be 1 more move. But I doubt ITachi will obtain it seeing as how Sasuke needs a way to beat him.
The Mange sharingan moves drained him out, we've seen moves that take a lot of his chakra reserve and effects his minds. If there is a stronger move it won't be a uchiha-related move and it would severly hurt him maybe both mentally and pyschically.
And you can't say you're just assuming things and we've barely scratched the surface of teh sharingan if you aren't very up to date with the manga.
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