Kid is reluctant at first, saying he did not complete the combat training needed, only for Mifune to tell him, "Neither did I."
What is the meaning of this sentence: only for Mifune to tell him?
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The intent is something like this:
Kid is reluctant at first, saying he did not complete the combat training needed, which was meaningless/irrelevant since Mifune told him, "Neither did I.
The basic idea is Kid's idea and statement (not having any training) did not have any impact or influence on Mifune. Regardless of what was mentioned, his response would have been the same.