I have the opportunity to add a rooster to our flock but I am not quite sure of the breed. I am thinking Light Sussex but I'm not positive. Any help would be great. Also, would this be a good addition to a flock of 2 EE, 4 ISA Browns and 4 RIR. He is about 4-5 months and my hens are about 2.5 months. Will there be any issues with them because of age? Thanks for your help.