Well, that's 10 year old memory for you.
It happens. That is why I didn't rib too much about it. I don't recall any "G" size in 1st edition, but sure it was probably added there first.
Otherwise see the reasoning for not liking "Plastic Logic" for why I don't feel tossing out size categories makes much since, as well the thread this was forked from....
1- I love minis. I don't always use them and would like to have them should I choose to use them for the most common needed things.
2- I don't need minis for everything, and a solo monster is often the thing you would need a mini for least.
3- Bigger than Huge probably should be solo only if you are using minis, or you need to switch to something like 40k Epic scale minis to allow for more to fit on your miniature surface.
Visual aids like minis are nice, but shouldn't dictate ANYTHING within the game rules. I have a dragon "mini" that I can use for "C" size if I want and it cost less than a DDM booster. It is a Halloween decoration.
So you can find the grossly oversized minis for things outside of needing the brand name.
I have no place to put a mini of Ao as it would be as tall as me to be to scale with DDM minis.