They were 4 hatched togther, this one is the only one that already has a red-ish comb while the other 3 still have yellow combs, is that not an indicator that it is a rooster?
If it turns out to be a pullet then this is the second rooster I've been given in a month that turns out to be a pullet. *sigh* And I still don't have a rooster
You're one of the few people who wants roosters!
I'm sure you can find one nearby by looking at the BYC Buy, Sell, Trade Section :
https://www.backyardchickens.com/f/16182/animals-in-need-of-free-re-homing