I am also confused by the cover issue. I do know that using cover HTML is a no-no.
I have been assuming that you can just leave out the cover image altogether and that Amazon would automatically insert the separately uploaded marketing cover as the internal cover. Hitch implied that is the case earlier in this thread.
Looking at the Amazon Kindle Publishing Guidelines (version 2018.2) section 4.2 is titled "Internal Content Cover Image Is Mandatory" and lists two methods of linking to a cover image from the OPF. It also states "Do not add an HTML cover page to the content in addition to the cover image." So, according to that document, the internal cover image is required.
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