"Anecdotally, Dropbox was founded by two guys who had just met each other."

No, not anecdotal. While I appreciate Paul Graham's cherry picked examples just like the next person, having looked at the history of hundreds of companies, it is all over the map. In general, you can't "create" success, you can simple try to avoid or mitigate failure. "People" make great companies, by being great about making it work.

But, sadly, and I really mean, sadly, monetarily successful companies (which may not be great companies) are for the most part simply created by having a product people want to buy. You can have a staff of imbeciles selling sugar to children.