Isn’t it true, too, that Wyll’s questline breaks completely if you do Ansur before you rescue his father? And even without metagaming, you can find Ansur, technically speaking, by going through a little pipe around the area of Wyrm’s Rock.
Emperor spoilers
Also I find it ridiculous how little reaction the party as a whole has to the revelation that the mindflayer in the astral prism is actually Balduran… like they have way less of a response to that, meaning no response, than they had to the fact that it was a mindflayer, in the beginning of Act 3. You’d think that all would bear remarking on!