Board Thread:Questions and Answers/@comment-98.95.22.178-20140731190807/@comment-6697950-20140812065650

Kai... Is FD and PB and MR AND Caliber part of Aincrad?...

@Anon If you want to remove replies, there's a more button at the bottom right of any reply. Click it and there should be an option for removing there. Better yet, create an account so that you could just edit your previous reply instead of double posting.

As said, the reason we describe Reki as the writer is because the manga are advertised like that. However, it just means that he's the write of the original content which the mangaka adapts. "Illustrated" means not only drawing pictures, but also what and how is drawn, just that they still have to stick to the main story. Most of the mangaka are more true to the story and only cut/change non important content to fit in their page limit, while others (especially the one for Progressive) make a LOT of changes, some of which don't conflict with the original, while others rewrite the facts (e.g Kirito and Asuna were only supposed to observe the battle against Bullbous, but in the manga they took part in the battle).

So basically, Reki's name is there only because this is his series, but all adaptations are free to adapt things their own way.