Thanks for answering my all my questions so fast, just 1 last question, how will the English culture work when England stays(Anglo-)Saxon, will Saxons just be English or will they become Saxon, because I am pretty sure German Saxons of 1400 were quite different from the Enlish Saxons of 1066. And seeing how the English culture of 1400 is also quite a bit different from the Anglo Saxon culture, I am not sure how the Anglo-Saxons could realistically be imported to EU 3.(my guess is that you probably just make them English). Not to mention the flags would also be rather ahistorical(which is already the case in CK 2, but still).
First picture is the Lancaster-English flag, used in EU 3, the second picture is the Dragon of Wessex, the English coat of arms during Anglo-Saxon times, which should be the EU 3 flag if the Anglo Saxons won the Norman and Norwegian invasion of 1066.
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In unmodded EU3, Saxon becomes English (we don't like it, either, but there really is nothing else to map it to). In modded EU3, cultures are all preserved.