Exists just two approaches to hire director. Each have drawbacks.
1. Grow organically from lowest position (Henry Ford claimed, he use this approach in FMC). Drawbacks - it is slow and such director will be definitely conservative, because he grown in company environment and probably will not want to change anything. Good things are - such way is good check of professional quality, and such director could be more loyal for company.
2. Hire director from outside, farther - better. Drawbacks - high risks to hire person without need knowledge/skills and definitely collective will see him stranger. Good things such person probably will be more open for innovations and will not much depend on company traditions.
Each investor himself decide, what he think more important for company - loyalty or innovation. I usually think, innovation is highest priority, but to be honest, life is complicated, and possible case in which I'll chose more conservative way.
And sure, human behavior is about will, for example, Lee Iacocca grown in FMC from mechanic, but once become president of other company.