Hi there! Welcome to BYC!
You've received a lot of good advice here. I just wanted to say I understand how difficult this is. Which one do you keep? That decision is hard, but I agree with the folks who said to keep the one with the best temperament. Don't necessarily keep the most dominant one. You want the one that is respectful of you and good to the girls. That takes a little time to figure out, but you don't want to wait for injuries.
I'm juggling 5 cockerels and roosters too, but I have three of them separated from the girls and each other. I have the space and coops to do that, but I'm not totally happy with it. I just can't decide who to cull and who to keep atm. I have one really great rooster, and just want one back up. I have 14 girls, so I can feasibly keep two. Right now I do have the two roosters with them and they have it all worked out, so you would think I should be settled about it. The reason I'm not is because the one in second place is not nice to people. I have to take a squirt bottle into the run with me to make him behave.

It works. He thinks I spit. So, that's just the way I do it, and you may have another approach. We are all doing the best we can for these little jabberwockies.
Is there a cockerel in the group that you are particularly fond of?
A good rooster will help you with the girls. Pippi, my top guy, herds them into the coop at night, and I have no doubt that he would fight to the death if any predator ever got into my predator proof run. So don't be discouraged. One of your boys will be the perfect one for your flock.
Good luck! Happy you are here!!!