I would just wait and see...I think it does have a few characteristics of a roo but she has more of a pullet. (especially at 19 weeks!) At that age you normally can tell without a doubt if you have a roo. Brahmas do mature a little slower but I would have still expected it to at least be "trying" to crow by now. I think he would for sure have a full cape of pointed feathers and a full saddle of them as well. I wouldn't pay too much attention to the red face and comb. Pullets faces and combs should be turning red by that age.
Please let us know if it crows or lays an egg!
Please let us know if it crows or lays an egg!