I think the Gigantic would be a different matter, since it is a combination of the navigational sphere, Ark as well as Shou's imagination. I'm leaning towards that the control medal having a defined limit on how much it can be customized.
I'm starting to think that with Shou having acquired the Navigational sphere and the cells of the Ark, the gigantic has somehow turned into the Deus Ex Machina. Unlike before, although we are fascinated by what the G-unit can do, it is still confined to certain limits.