well, most my silkies have the small dog attitude (the hens are worse than the roosters) but I have been able to run two silkie roos in my silkie pen without to much problem
I've had great luck raising a young rooster with an older one and them getting along. There might be a fight here and there to set who's the top man, but that's it. You'll have to watch them to make sure it doesn't become more than that.