You want to know of every gate, even those too small, because the GSX menu is not used just to enable GSX services, but also as a position method (see my previous explanation) and, I believe it will be confusing to not display all parkings because, if a Terminal group had all its parkings too small, there would be an empty list, and people will wrongly believe it could be a GSX "bug" somehow, I can imagine all the complaint about "missing parking spot in the list".
So no, the list will remain as it is, which is the best possible choice: give the user all the information, and clearly indicates WHY a parking can't be selected.