Here's another puzzler: I have the quest Deathblow to the Legion (
http://www.wowhead.com/?quest=10409), which is an Aldor quest that I gained after finishing the various Shutdown Manaforge Xs; I came to this quest series late, having finished most of the zone without declaring my allegience. I then came back at 70 and completed all the way through to Deathblow.
A guildy, however, isn't getting any quests after the final Manaforge Shutdown. He's also 70. I thought it was reputation - I was Honored, he was just short - but that turned out not to be it. I'll update when we figure out which other quest I've done that he hasn't unlocks Deathblow.
edit: There was an Aldor quest from the small camp near Manaforge Ara that he hadn't done.