Hi, welcome to the forum. You are still learning your way around the forum categories, and you may find that you get more responses if you post under chicken breeds. You can find that by holding your cursor on the forum tab at the top and getting the drop down menu.
I'll try to respond to your question. It sounds like you want a Silkie rooster who will be dominant even though he has no game fowl genetics in him. An only rooster in a flock of hens that he grew up with and are not too much bigger than him will probably try to be dominant and keep track of the hens in the flock. He will give warning calls if he notices a hawk or something flying above. There are limits to how much any rooster can protect his flock. No matter what size the rooster, he can't really fight off a predator. Silkies are smaller than the average chicken, so they are not as intimidating.