The hard feathering is the only thing that really points to not purebred Silkie. I don't see any other significant indicators of what the other breed could possibly be.. everything except the "silkie" gene is present and mostly dominant or partly dominant..
Bred back to your silkie hens.. will (should) still give you 50% silkie offspring and 50% will be hard feathered. (presuming he is hard feathered from being a first generation Silkie cross).
Some folks call these shady crosses "satin" instead of Silkie.
I'm gonna highly recommend NOT using the auction anymore.. A) it's not what you thought or was advertised to be.. and B) more importantly.. it's a great place to pick up disease that hasn't yet presented.. so many things have a long latency.. Marek's for example can take anywhere from 3-25 weeks before presenting ANY symptoms.. and birds that somehow have natural resistance (or were vaccinated) may be carriers but never show a single symptom.. still spreading the hidden disease like typhoid Mary.
Your flock is cute!
. Luckily we quarantined and my sister who works for a vet was able to give us treatments for parasites.
