According to the American Game Fowl Society's show standards if a judge suspects a bird to not be game they can remove the bird from its pen, request another rooster be brought around. If the cock in question does not flare its hackles or make any attempt to strike at the other bird (despite being held to prevent any injury) then this bird is considered not game and thus disqualified from the competition.
And to the people asking whether GFF's Hulseys are game, you need only to look at their website, which states:
http://greenfirefarms.com/store/category/chickens/pumpkin-hulseys/
"They are gentle to humans, and
if integrated into a flock at an early age, will also tolerate other roosters."
Toleration of other roosters goes against the very core of what a
gamefowl is, therefore it goes against being an accurate representation of the breed. Afterall, Pumpkin is a color, Hulsey is a bloodline, and American Gamefowl is the breed.
I will also state that although they say on their site:
"If you have questions about the weight of the roosters or the station of the birds, I will assume you are buying them for cockfighting and will not sell them to you."
that this is counter productive to those wishing to show them in the exhibition hall. All breeds have standard weights, stations, tail angles, etc.
Just adding my 2 cents.