Not all the bosses in BT and Hyjal take aving Kael and Vashj on farm most the time once you have 25 people attuned you can goto Hyjal and kill the 1st boss to step into BT. I agree with you lunaar im hoping guild will go in try maybe the 1st few bosses in those two zones then go back for kael and vashj because the bosses deeper into the zone without having t5 gear youll never be able to kill.
Light, grant me the serenity to accept the things I cannot change, the courage to change the things I can, and the wisdom to hide the bodies of the people I had to kill because they ticked me off.