Also, since Itachi gave Naruto some Jutsu that Itachi hopes Naruto never has to use and you're speculating that it has something to do to block the extraction. Why not just say it in the first post? If you just said that from the begining, it would have made a clear point instead of leaving it open ended.
Theories are made out of speculations from the manga storyline to give clues and hints for events in upcoming chapters. If some of the things that you claim happens in the manga, then you can be satisfied that you got it right.
But if it doesn't happen like this, don't be disappointed, because the author probably had something different in mind for how his story is supposed to go.
Do I believe that Naruto's "cloud like" Jutsu has something to do with Reverse summoning? Not quite. Jiraiya had alluded to Naruto having something called, 'that jutsu', and it can only make me think it's something that may either:
1) Draw out the Kyuubi chakra more at a dangerous level
2) The jutsu has been so incomplete that it causes bodily harm to Naruto himself.
Whatever that jutsu is, it looks like Naruto might be getting a handle on it as a result of his sage training.