How about Elon Musk? He would rate n=3, don't you think?
Does PayPal count? How much relied on the others? I don't know.
Tesla, Solarcity and SpaceX are all on the verge, but not quite there yet.
5 years from now he either has a n=3+ or is known as a massive flameout. but yeah, good shot at being a SJ 2.0.