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External reikaku is tied to the sense of sight, that's why Aizen can affect it. But by letting Aizen stab him, Yamamoto could analyze the spiritual pressure INSIDE him without any interference from the 5 senses and thus confirm that the Aizen stabbing him was real. Something else to note is that since your sense of space and time are dependent on your 5 senses, even your instincts, Aizen could theoretically make illusions on the level of something like the Tsukiyomi from Naruto.