A whaaaaat? lol -had to go look that up. Do you mean he is a cuckoo mixed with black tailed buff? Or something else? The breeder I got him from raised golden cuckoos and did have some males that were very light versions, even lighter that this one. As far as I know he is supposed to be golden cuckoo.
I wasn't going to use him to breed with my other GCs because he is too light and I have a younger male with better coloring and more defined barring. I was going to use this one for a project but it would be good to know what he is crossed with first?