Good to Great (part 1): first who then what

Reading Jim Collins's popular book Good to Great, I realize the importance of people.
In his description of level 5 leadership, he stressed the importance of: Get the right people first, then let them decide what to do.
Having unsuitable people will affect the culture and de-motivate the right people.

What defines a person? It's his/her previous experience, education and "character". Among them, "character" is the most important, because it is the only thing that can't be changed, and it will affect his/her future growth. With the right "character", one can quickly gain experience and obtain new knowledge.

What defines the "right" character? 
I would say integrity, optimism, open-mindedness, responsibility.
These are things that's formed in the early stage of life and can never change in the later life.