Again, I don't think typical rules of chronology apply here. The Bronze Dragonflight seem to be somewhat parachronological in nature, so it's possible that the retroactive transformation of Nozdormu would just result in the timeline rearranging itself after the fact or even just cause the events of both timelines to happen at once.
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This is wholly irrelevant to the point that was being made and the discussion at hand, anyway. Though my example was highly subjective at best, I was trying to illustrate different sides of Darkarath's point in acknowledgement that his concern had precedent. Further discussion about that topic is meaningless.