Is it possible that we are all just overthinking this? Was there any indication before Isshin fought with Grand Fisher that he might be a Shinigami? If not, isn't it possible that Kubo wasn't going in that direction and then suddenly decided it would be interesting if he did make Isshin a Shinigami?
It seems like either way there will probably have to be some retcon done to make Isshin's story make sense.
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