The comb is a touch redder than the others'. Some behavior things he/she does make me lean towards cockerel. Guess we'll see! Luckily so far he/she has a pretty chill personality and we have no problems keeping a rooster. Thanks for the help and i'll update when the truth is revealed!
Well, we're in week 13 and he's definitely a boy. About a week after I posted this it became abundantly clear. Even though we weren't expecting him I love having him -- there's definitely a different feel to a flock with a young roo around, and he is a sweetie. Here's hoping he stays that way!