The roo was a crele project bird (not a true crele) and the hen was solid black. This cockeral isn't black. He's blue, but has the added barring and now the odd orange spots that have started to come in the last few weeks (but the first few weeks he was just a solid blue).
He IS a variation of sex-link Crele is considered barred and anytime you cross a barred male on a solid female (if I remember right) you get sex-link offspring. So he will be an odd color but could turn out to be very attractive.
Actually, you have to cross a barred hen with a gold male to get a black sex link - BR hen with RIR or NewHamp roo, etc. When the red gene is on the hen's side you just get bleed through (as the OPs chook has)