Granville is stuck on a pile of rubble where the quest starts. I think he got yeeted by one of my grenades when I tried to collapse the ceiling to connect stairs. Just doesn't move regardless of dialogue option, further grenades or building. I mean, if in doubt, more grenades should do it - but... :D
Also, dialogue answers are seemingly off. Why would I leave him if I just told him to come with me?
nevermind, resolved it. placed a foundation under him, that fixed it.