When I played Gale companion, Mystra tells him it was she who stabilised the orb and conditioned it , so it could absorb the weave of powerful artefacts. It made me think... Mystra is one of the very old, very powerful Gods. She should have powers to foresee the future. And so, I wondered, what if, she was preparing Gale already there and then as a "bomb" she would have in store for any future crisis.
The fact that the absorption of the weave suddenly starts faltering at a time when "the bomb" is required, somehow reinforces this idea. If Mystra created the process of weave absorption, it should be she that also breaks it down at the convenient time.
That would be kinda evil from a mortal's perspective. But the Gods are above that. Like Ketheric, Gale is just a copperpiece in Mystra's belt.
