abducted after a sharran mission suceeded in capturing a mighty githyanki artefact. Obviously she could not return it to her masters yet. Strange: She does not seem to be in a hurry to deliver her cargo. The mindflayers obviously knew that she has something special on her.
As for Bane, he already holds command over the goblins god Maglubiyet, so
the goblin priest in a cage calling the absolute a false god and praising Maglubiyet makes no sense As loviatar is serving bane the presence of one of her priests points in the opposite direction, he should provide more information
Shadowheart wants to deal with the tadpole first, you can actually have a discussion with her plan after that is done if you want. She's going to Baldur's Gate has she has "people" there. It probably was her destination before getting snatched by the mindflayers.
They didn't kill the Maglubiyet priest, you think zealots of the "one true god Absolute" would have. He's also sure the Absolute isn't a true god, so he probably knows more about it. I think I'll kill him in another PT and see if he is more chatty dead.