Originally Posted by metaphysician
Actually, I don't think Jane finding the Aether was coincidence. Remember that when Jane was in Asgard, it acted without her desire to "defend" her. I would not be shocked in the slightest if the Aether *deliberately* drew her towards it, via the Convergence gates. It "wanted" to get loose into the larger world.
As Thor, or perhaps it was Odin can't remember, states immediately afterwards it's not defending Jane it is defending itself. Admittedly, it could be possible but this is the sorta thing you need to explain in the movie. But they they also failed to explain that the cave could apparently block Malakeith's Aether homing sense...