I've found it a big problem on blue marans. If it just showed up in his second year it shouldn't be too much of an issue, just keep an eye on his kids lol. personally i have a vendetta against leakage. I always select against it, when i have comparable birds i look for any trace of it and cull based on that. the tell tale places are shoulders and hackles close to the head. sometimes saddles too, but the first two areas are worst. If i ever saw red on a breast it would be gone sooo fast!