a) Head Manager gives a small boost in all player's abilities. This boost depends directly on the Head Manager's habilities.
b) Head Manager has influence in additional factors, like aggressivity, offensively, penalty efficiency, set plays efficiency, Extra Time (ET) boost, and motivation.
In option b), we would have coaches with the cited and new abilities, but that can be hired in the same tab of training coaches. Head Manager wouldn't have any influence in player's training.
Image with a suggestion of Head Manager's abilities in case b):

Give your opinion. Do you prefer a), b) or both?