Dont breed just for looks or to keep things pure.... Consider everything else as well... like health, dominance, size, athleticism, brains, and instincts. Feather quality, proportions, egg productions, flying skills, etc, etc.... Their attitude towards the opposite sex and chicks.
I am not afraid to cross breed different strains. In theory you have your whole life to experiment and try new things out. if you dont like them you can always sell (or eat them). Every year is a new opportunity to test new breeding pair. And compare offspring to previous years (if you keep older stock around like I do).
Great fowl werent created by keeping things the same.. its a continuous improvement process.
disclaimer ***Im not an expert***
My suggestion would be to delete the entire post above from your brain. With all due respect shubin that's got to be the most selfish and disrespectful post to all the people before us that spent their entire life plus generations after to refine a strain/breed to be the best gamecock and for u to suggest to cross and make up designer chickens is the very reason these real gamecocks are dying off after all the hard work.
Imo keep "pures" pure and do crosses if u wish but don't lose sight of the reason we all have these birds to keep them alive in a world that for the most part would like to see them extinct