Like I quoted, was the way it was explained to me.

seated officers could would be a master in one area and an expert in another
Lieutenant could master 2 area's and be an expert in another
and captains can master 3 Area's and be an Expert in the last. 

But i get your point, which is why even though Gio is a Kido concentrated character I keep his numbers low in the IC to avoid being broken.