Nice looking bird with good substance. I like to see a little more and a little higher tail, possibly a wider base to the comb as well. He would be a good place to start for someone wanting to work with the birchen color pattern, though he does, as you said, lack lacing on the upper chest. Having said that, and having made the same mistake a number of times, I would caution you against reducing to just one breeding male. With chickens anything can happen - disease, accidental poisoning, predators, going infertile - and when if you lose that one male you could be out of business in that variety.