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You took the manga completely out of context. Kabuto struggles with his identity - who he truly is. Hence why the whole Izanami ordeal. That entire conversation with Itachi had absolutely nothing to do with Kabuto's ability (or lack of) to use the jutsu gained from infusing himself with the DNA of others. The DB doesn't support what you're attempting to suggest neither.
So how does Kiba easily counter Mugen Onsa?
First, it should be noted that hearing the sound of the flute doesn't equate to being immediately caught in Tayuyas genjutsu. This was made evident, when Shikamaru first heard the sound, he was still able to
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, and even
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, before being affected by it. This is also why Temari was able to swing her fan fast enough, in order to counter Tayuyas jutsu [
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].
Even if we were to assume that Kiba has zero intel on Tayuya, he'd still be capable of countering it. Just like how Shikamaru immediately hypothesized that Tayuya was using a sound based genjutsu, there is no reason to believe that a much older and more experienced Kiba wouldn't come to the very same conclusion. Especially given the fact that both Akamaru and Kiba can smell out chakra [
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]-[
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]-[
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]. Thus, smelling chakra in tandem with hearing an unusual sound, while applying some ninja intelligence, should allow Kiba to conclude what type of an attack this is.
In order to completely counter Tayuyas entire tactic, Kiba only needs to drop a few smoke bombs in order to conceal himself, and immediately create two
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, which are
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. The two Kage Bunshins will break Kiba and Akamaru out of the genjutsu, and then they will form two separate Double-Headed Wolfs (One Kage Bunshin with Kiba, the other Kage Bunshin with Akamaru).
Garōga GG.