BACKAsk Armin van Buuren Anything

Michał Rybacki question for Armin van Buuren is

" I'm curious about story with Again. Why the probably original mix is called "Armin van Buuren Remix". If original would exist then you can create remix, but how to create remix when original doesn't exist? Couldn't you named it "Again (Extended Mix)? Greetings from Poland "