That's info that will need to be learned over time there's too much to them to just tell you. Check the greys head if it looks like he had a comb chances are he was straight if he look is like he never had a comb chances are he's pea. Also putting hens together that have not grown up together can be just like putting cocks together as far as books grit and steel and the gamecock come to mind others will chime in to add to this post. Thanks for taking an interest in these awesome birds that to me are slowly disappearing