Tom Roebuck here.
Nope, mottling on the original male was pretty sparse actually. I didn't want to have an overmarked male to start out with so chose an undermarked ckl. I had another pullet that would have passed for a Columbian that was a full sister to the female in the second photo. The female in the second photo actually has a salmon colored breast with some mottling. Realistically, I would need to hatch a couple hundred of these things in order to get a good idea of the pattern results, but since I already hatch around 500 chicks (550 this year), I didn't bother hatching a ton of this little project. What you can't tell from the young bird photos is that they are starting to come in with a few Mille Fleur looking feathers here and there. The ckl with all the white will actually be much darker. His adolescent feathers are coming in more Buff Columbian looking. As the birds mature I'll update the photos.