Having a bunch of awesome people increases the likelihood of it happening...
I'd hazard a guess and say the non-repeatability comes down to the awesome bit.
It is easy to label someone as awesome after coming out on the good side of a rough patch. It is much harder to be comfortable in that label when sizing up a potential co-founder.
If you assume the set-equivalence that "awesome people get on the same page quickly" implies that "people who get on the same page quickly are awesome", you then find, by http://en.wikipedia.org/wiki/Aumann%27s_agreement_theorem, that "awesome" means rational.
It is easy to label someone as awesome after coming out on the good side of a rough patch. It is much harder to be comfortable in that label when sizing up a potential co-founder.