Even though the majority is going against it, I think Izanagi makes more sense than Kamui.How do you think Tobi escaped Itachi's timed Amaterasu which got activated when he was telling Sasuke the truth about Itachi?
Intangibility wouldn't have worked here .I doubt he could have sucked it in using Kamui.
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My personal guess:Izanagi
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"Fortunately I managed to keep a few secrets even from him..."
Tobi never made any real effort to hide Kamui. Whenever he was attacked he let attacks phase through him. He never revealed it to be an MS technique but he certainly didn't hide it. I think the secret he kept from Itachi was that he could use Izanagi. It doesn't make perfect sense since Itachi was meant to believe Tobi to be Madara but it makes more sense than thinking Kamui was a big secret.
Going against this is that Itachi must've learnt of the forbidden techniques somehow since he could use Izanami. Since Tobi was his teacher he could've learnt them from him, however there is still the fact that Itachi could read the tablet and was versed in the Uchiha history.
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