You're right... I worded that poorly. I guess what I mean is how will just one coach rating effect the various aspects of a game. For example, some coaches are great motivators while others have a great system, so I think it would be difficult to provide adequate rankings that reflect a coaches complete ability.
If you slap a coach with a 90 coach rating, would that really help the game in many ways? All the players would get boosts because of the high rating, but what I would want is this rating to effect specific areas of a team's game, so it would add depth and variety to the gameplay if they were rated in all aspects of their coaching.