I meant that adding a DOCTYPE when there was none to start with might be incorrect (whether or not flightcrew and/or epubcheck complain about it is a different matter).
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I did run my test epub through EpubCheck after it was cleaned by Sigil and there were no problems noted.
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You mean that a document with and no DOCTYPE passed epubcheck? That sort of agrees with the second part of my message: a DOCTYPE might be unneeded.