I think subman is right. They had the full strength of the Kido Butai available, the element of surprise, so they should have made a push. And they must have known that situation would never return.
I think Admiral Nagumo was too cautious, and missed a great chance, and I think I remember he was acting against Yamamotos will in this question.
Well, the Japanese would have lost the war anyways.
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