Paul Beakley Lovely writeup, again! Yeah, the assumption is a Zoom In focuses on at least one main character. You could do a Zoom In entirely with quick characters if you like and nothing ought to break, if that’s what the group wants to go with.
Also, if you’re worried about people sticking around in the one age, it might be worth pointing them towards Wonders? Wonders don’t care about your mood, and can have huge effects on the world for future ages.