Breeding for colour

[Pyxis]

Here’s a photo of the blue bibbed drake.
View attachment 2045078
By breeding him to a chocolate bibbed duck what colour would that produce? If he was a normal blue bibbed I’m pretty sure it would be black bibbed and blue bibbed, but he carries other things so he may produce something different right?

I'm not sure if that brown we're seeing is indicative of him carrying other things, or if it's just rusting or sunbleaching. I'd count on only blue bibbed black bibbed ducklings and if you get other colors it'll be a happy surprise