It's been forever since I've done the quest but I remember my ally lock still having the mats (or at least the expensive ones) left over after the quest. I think everyone will get credit with just one set of mats as long as everyone has the quest.
Quote Originally Posted by 'blast3r',index.php?page=Thread&postID=123933#post 123933
A question for those that have done the quest via multiboxing.

What mats in the questline is it okay for just one toon to have? There are a lot of mats involved and just curious if anyone knows. I just killed about 400 Owlbeasts (who knows maybe a moonkin, too. ) and bought 15 black dragonscales from the AH (killed 7 dragons and got one scale so I said screw that!).

Any help would be most appreciated.