Dunbar's number is another manifestation of Coase's ceiling. Coase's insight is more general, as it applies not only to every other kind of organizational dynamic, but also to, e.g., the scaling of friction in mechanical systems.
This is where I would push, if Dunbar's number is a manifestation of the same thing, shouldn't it move when the price moves? Coase's ceiling has moved over time, while Dunbar's limit isn't. What's happening there?
The intersection in this case comes from source of truth information getting out of date with moving code. You can't tell whether its wrong until its been acted upon. So people stop trusting the docs, which is where Dunbar's number comes up again