keep in mind this will throw only 25% mottled. a real issue if only small batches are set. also not all of the non mottleds will be carriers from the cockerel-pullet cross. combine that with small numbers of chicks, a bit risky.
it is a good way to increase traits not related to mottling, productivity or size though, but still best with more than less samples to choose from.
also just realized the hen does not have the black bar by the mottle.. that might be unusual as it seems there is a tendency for the black bar to be present(mille fleur is an example of mottle with the black bar)
I wanted to say something more but couldn't remember at the moment and that was it, you said it.
So what do you mean lack of the black bar could mean?