The folklore.org links I provided go into this and more.

As typed into another reply in this thread...

I think the conclusion to be drawn from discussions like this is that although narcissists like to suggest they and they alone provided the “magic spark” that make projects successful, it is an entire team of people who actually create revolutionary products.

The business press—and society on average—love the myth of the visionary entrepreneur, but upon close inspection, success has many parents.