On my fourth reread of Mother of Learning just realized looking for the other primordial prisons also went nowhere, but on the other hand we also know for certain it never would have gone anywhere to begin with since the Sovereign Gate was only attached to Panaxeth.
Honestly I think it would've been more interesting for them to have discovered the location of another prison and found it empty and all the questions and theories spurred from it, rather than inferring it from Silverlake's explanation. I don't even think we even hear more about their search after consulting Kilnfather and we didn't even read about that conversation.
I feel like both the elder elemental scenes could have been cut, but the the conversation Zach and Zorian have right before meeting Stonechild is needed to introduce the idea of physically stepping out of the loop. Now I'm not even sure what knowledge of the locations of the other primordials would even do for them in a sequel or outside of the loop in general.
