Kinda reminds me of a Silver Campine, but I have not had that breed so I don't know what they are supposed to look like at 5 weeks. Do you have any baby chick pictures to check down pattern/color?
Your Lucky, we had a campine roo who was honestly the nicest roo ever, didn;t particularly like people but never did anything to hurt is, and he was gentle with the hens, and also for some reason he was silent. But we are SURE he was a roo