lilbeast, given this post is 6 years old I had to reference the original post again. I have seen young pullets this age have a pink comb like this. I have seen pullets that came as large, or at times depending on their genetics, even larger than their brothers. I have also seen pullets that are more aggressive than the males in the batch.
Most people will tell you a hen will never get a pink comb until laying age, but that isn't true. It is believed by many, even some of the oldest poultry breeders I know who have had chickens longer than I've been alive will look at a hens comb and see the red color and say "She's about to start laying." as I've had them do when they come to my yard but it isn't an accurate assumption in my opinion. I have had many a young pullets with pink to red combs around 8-12 weeks old and they never start laying until months later. I actually have photographs of some of these.
In my experience, the best indication to sex is usually color and sex feathers (i.e. hackle, saddle, tail sickles, etc.) The only way that these can be wrong is the bird has to be either henfeathered (where the cock takes on the characteristics of a hen's feathering, that is short and round instead of long and pointy; and because of this he will also have a hen's coloring) or a hen has to have gone through ovary failure which causes her to produce less estrogen and from there she will take on male characteristics (this is recorded in a few different cases, and there is a book online you can read free on the right sites on this subject called "The Genetic and The Operative Evidence Relating to Secondary Sexual Characters" by T.H. Morgan. )
Even though I've had poultry all of my life and I have been breeding birds myself (serious breeding that is, not including my little mutt crossings I played with beforehand) for about 12 years or so now, I'm still learning (or I try to) and I'm not convinced the little bird in question was a hen (even years ago also though, I said I'd give it more time as I was unsure.) In most cases, birds of that color will molt out as hens but I have seen in easter egger's (since this post) because of them being crosses they have similar coloration's and then change with age and are roosters. The two little streamers, though not guaranteed, also would hint towards a rooster. I say not guaranteed as I also have a hen (I still have her) which had two long streamers like that though she has lost them now- I believe I have a photograph of that too with her at a young age (somewhere around... 8-12 weeks) and then a more recent (year or so ago) where she has lost the streamers.
God bless,
Daniel.
