I'm in complete agreement.Yeah, I'm thrown, too. Pullet crowing is not so common as one would believe from reading these forums, so I'm inclined to think it is a very late developing cockerel. But the feathering shows no signs of that, and if 5 months is right, then that adds to the confusion, because it should be showing male feathering by then.
Will be very interesting to see the outcome!

~Alex
It makes me nervous for my 3 new chickens I hope are all hens!!
Its too bad you can't keep him!
My heart breaks for you.
