@iatheia - dwanthny has been spot on with all his comments. There is absolutely no difference between using this plugin to generate a cover versus downloading a cover via metadata or from other sources. It is manipulating a cover.jpg file that you can view in calibre, nothing more, nothing less. It has nothing to do with what you do or do not see on your Kindle when you open the book.
Just like any other cover you associate with your calibre library, the jpg image will not get inserted into your mobi file until you do a conversion. Or in very special circumstances during send to device/save to disk (where recognises how to automatically update the cover, such as a calibre conversion being done on that format in the past).
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