Ideally you would like to hire more than one, but I think my use of the word "discourage", was not the right one. What I ultimately wanted to say was, you want a balanced team, where no individual development pattern sticks out.
A very high impact employee could easily be the result of having multiple poor employees, improper planning, and so forth.
A very high impact employee could easily be the result of having multiple poor employees, improper planning, and so forth.