The flames are the manifestation of his reiatsu. It's not an ablity that he can cancel.2D Physical heat doesnt matter to a 3D being based on this analogy of dangai fight. Also it's yama's reiatsu that produces the heat not actual flames.
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Kido worked on that same Aizen, who was even evolving further.
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Lmao the Aizen cancels everything with reiatsu bullshit should stop since it only worked once against a certain type of technique, and not against physicall manifestations.
Lol don't even answer.