Alright, I finally went and looked it up. The earliest known composition was during Day of the Dragon, when it consisted of:
Antonidas was replaced by Rhonin, then Jaina.
Kel'Thuzad was likely replaced by Ansirem Runeweaver, since he was on the Council around the time of Warcraft 3.
Kael'thas was replaced by Aethas Sunreaver, whose replacement is not known (and possibly has not been chosen).
Drenden and Krasus were replaced by Khadgar and Karlain.
And Modera is a freaking SURVIVOR.
Okay, so it goes
Antonidas (War 2 3 - Died during War 3), Rhonin (War 3 - Sometime after Dalaran was retaken), (Jaina - After Rhonin's death ToW - Present)
Kel'thuzad (War 2 - Left around the start of War 3?), Ansirem Runeweaver (War 3 - Present)
Kael'thas (War 2 3 - Left during middle of war 3), Aethas Sunreaver (Wotlk - Mists)
Drenden (War 2 3 - Dissapeared after the siege of Dalaran), Karlain (Sometime before ToW)
Krasus (War 2 - Left before War 3 - Did he show back up for his spot before his death?), Khadgar (ToW or earlier? - Current)
Modera (As Vegs put it, FREAKING SURVIVOR!)
So of these people, the only ruling council of the Kirin Tor that could have even voiced their concern for Kael and the elves treatment at the hands of Garithos was Modera and Ansirem Runeweaver.
Was there anything to suggest that they were not comfortable about the decision? Or did Garithos just pull a "Saved your sorry asses, so don't complain about my methods!"