Earlier quoted context omitted.
Just to play devil's advocate, doesn't that rest on the assumption that the top 1% of software developers are also strong enough networkers that they can get a job pretty much anywhere without using the formal channels which would require item (d)? I'm not at all convinced that's the case, even though I understand that there's some truth to the conclusion.
The point is that they don't need to be networkers, because they will be networkees. i.e. other people will notice how good they are, and actively try to get them into appropriate jobs. I think this is largely true, though it takes a while for reputation to spread. There are some brilliant young developers who haven't yet been noticed by anybody in a position to hire them -- but they won't stay in that situation more…
A quick example: http://9fans.net/archive/?q=rsc&go=Grep