First, what dual engine and single engine planes have to do with PG's comparison? He was referring to the fact that if a component of a thing statically represents the number one problem (for example the car's engine breaking down), it doesn't mean you should remove that component (the engine).

Secondly, while I agree with you that if you planned everything by yourself and are willing to do it alone, you shouldn't just look for co-founder when you can start implementing by yourself with some employees. But I got to warn you that's pretty extreme and may get you looking like a 70 year old when you are 25 very fast, because of the exhaustion it causes to run a big venture by yourself.

I don't know statistics either and I would like to put [citation needed] everywhere I look on the internet but a two men team has more potential on the long run then an one man army because the two founders motivate each other, share problems and have a larger knowledge base to solve them, make it more fun and pleasing to work on a startup. I like your post because you raze awareness regarding the importance of having good cofounders. Anyway some people like to work alone one and they do it better that way, but I think most men might fall apart on such high pressure, especially if they don't have previous experience in making startups.

One more thing is that it's very hard to find good employees that are willing to work at a startup, even harder to pay them while you don't have any revenues in site.