Looks like a girl to me too.
Plus, I think that not everyone is reading the entire thread and all may not know that you took the first two back and now are asking about the bird in the middle of the thread...
At 5+ months wouldn't you expect more obvious development to show that it's definitively a cockeral? The two you took back were more clearly boys, but this one is kinda iffy to my, albeit non-expert, eye.