Yeah, I said what I said for the dramatic effect of it anyway.
Pretty much every ability of the GoM undergo a dilution effect anyway to 'somewhat explain the logic or to balance the overpoweredness' of their abilities. The big question is always in what direction does the dilution go.
Your Eyeshield comparisons are apt, but it seems like they're more in line of the 'application' of the eye technique, in that because of the 'Eye', Akashi is able to casually use center-gravity shifting techniques or act as if he has god-impulse. ( since he reacts before the action occurs ) There's probably more to the application side as well, given his foreboding words towards Kuroko.