Beautifully done. You've managed to tie together both what was known and what was likely at the time you started this, and you've also incorporated a wonderfully fleshed out view of magical/muggle perceptions (and the varieties of them that exist). I also find Arthur's hypocrisy a nice touch - in the end, he is doing to Draco what Ginny found so objectionable under only a slightly veneer when the words were in Draco's mouth - judging based upon bloodline, as opposed to personal actions or abilities. All around a lovely piece of work - well done!