The human brain is a spectrum, and is highly malleable. There aren't types of people - just people with more or less predisposition for certain traits.

That's not how evolution works. Groups of humans don't just naturally produce the "emergency thinker" phenotype when the group has too few. Individual genetic lines might find a set of local minima that work to them and stick to it, but this is because it is beneficial to those genes fitness - not because it benefits the group.