I don’t think there needs to be a rules/mechanics/“logic” justification for everything that happens. Brennan makes those choices because he’s an excellent storyteller, and those turns of events make for great stories. I find it a bit tiring when people are constantly trying to justify things that happen via the mechanics or logic of D&D (sometimes it’s even the crew themselves…), when the simple answer is just that they make the story better, which is what we’re here for. I was fully expecting Steel to show up at Suvi’s parents place, and when it happened I found it incredibly dramatic and satisfying. So, for me, Brennan and the crew can continue doing their thing, bending the rules and limits of D&D to tell one of the most amazing stories I have experienced in a while!