Did they send the leaders of those 10 countries, or just the representatives?
It's not about any of their hierarchical importance, it's about how useless that idea is.
The CEO sure has the last word on everything (and even that isn't true), but he isn't the actual expert on its platform.
Having the head of state would make no sense there, they have better things to do and sending countries representatives that actually have time to learn and understands the actual matters make much more sense.
Just like sending CEO doesn't make sense, sending actual experts that can answers theses questions much better make much more sense.
[1] sure, in practice they’d rank 80/186 by GDP (IMF 2018) if they were a nation, but they aren’t that kind of entity.