They definitely all look like roos with those combs and waddles. I’m sorry my first 2 Silkie chicks I bought were both Roos too. A black and a white. I guess we had the same luck
Looks like a cockerel. I did the same thing last year. I called to offer the third crower back to the breeder, and she felt bad and gave me two more 10-week-olds. I knew as soon as I put them in the quarantine coop they were both boys because of stance and leadership behavior. Out of five, no pullets.