You need someone that behaves like James Bond more than you need someone that is an expert in some particular domain.
Losing focus is another way that founders get off track.
Starting a business is like riding a wave between life and death. If you can hang on long enough, you're bound to succeed
A single mediocre hire in the first five will often in fact kill a startup.
You're either not hiring at all or it's probably your single biggest block of time.
A third advantage of mission oriented companies, is that people outside the company are more willing to help you.