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Cooperation can get harder when projects get more complex. The coordination skill that you need to succeed with a project like going drinking at a pub together is a lot less like the coordination skill you need to get a project like Dragon Army working.
So... is your hypothesis that high IQ gives more of an advantage in clearly defined mathy situations, such as playing a Prisonners' Dilemma tournament, but less of an advantage in real-life situations where e.g. the coordination skills are more important?