Apologies, I apparently lost track of this thread! If you want more mottled birds out of him, then getting Mottled hens would certainly do the trick! If you can find Mille Fleur hens, you should be able to get some MF-like and mottled out of that cross as well. 🙂
He appears to be a mixed breed, not a pure Cochin. Cochins should not be so leggy, their feet should be more heavily feathered, and their shanks should be yellow, not white or pinkish like his. He's definitely not a pure-breeding coloration, either; to me, he looks like he's blue mottled with...