Even if it use it, It could have killed the Weave, i call that rule changing. For me it's enough to justify we can't remove those tadpoles with regular spells, even true resurrection. If i was DM and crafted this story, i'll probably state than tadpoles are not 'seen' as different from its hosts when this kind of spell is applied to them.
Can't wait to know how we ended up with illithid stuf mixed with this so legendary magic. They're not supposed to be very fond of :p
About Gale, i believe he say it himself? But maybe i misread him
