My hunch is yes the weighting is even, but I'm obviously not the (lead designer/authority figure).
It's not that an extraordinary head coach in a given area is going to spend that much more time with the players in his specialty, but that he may "make worse coaches better" and transfer his skills through them by the old dictum, "Do it my way (as well as you can)."
If the average is skill level 3, then a HC with a 5 skill may make up for level 2 coordinator & position coaches. Naturally if the skills are 5 across the board, those players will develop like lightning (or so one would hope).