Ok. Mine just have it on their wings and the older one has some on his tail feathers.The pattern changes as they get older. Here are some examples of the barring in my partridge. Usually only occurs in the osprey feathers and to some extent in the tail ribbons.
Where as in the cuckoo it can be all over the body.
Lovely birds you've got!
I googled a pic of a partridge silkie rooster. Mine looks quite a bit darker.