Originally Posted by
Aucald
I've often wondered exactly what Aethas thought of Kael'thas' imprisonment in Dalaran and the Kirin Tor's involvement in it and subsequent events happening later. We know from the "Mage" comic that he was present in Dalaran when it was preparing to take flight from Alterac to Northrend - which leads one to assume that Aethas was present there, as he was a member of the Six, when Kael and his forces were taken prisoner by Garithos. "Mage" doesn't seem to cover Aethas' take on the matter in any real sense - but it would definitely help to know that to get a better picture on why Aethas has made the decisions he has.
I got the impression that Aethas went to Dalaran afterwards. It doesn't make sense for Vereesa to fight against Aethas' admission into the Kirin Tor before WC3.
This was Archmage Aethas Sunreaver, the blood elf who had struggled as hard to gain admittance into the Kirin Tor as Vereesa had struggled to forbid it.
--Tides of War
That's about general KT admission, not even appointment into Council of Six. It's mentioned that Aethas' rise through the ranks in Dalaran was unusually fast.
From his letters—and third-party rumors—Lor'themar understood Aethas to be idealistic yet shrewd, and far too young for the position he had carved for himself in Dalaran.
--In the Shadow of the Sun