But in fact it is brown. Have all these horses that you have been calling bay been tested to show that they do not carry At? I am highly doubting it.
Foal coats... I will not give a definitive on bay/brown from a foal coat alone. That whole idea is just asinine.
All of the adult horses that you have posted are brown. Plain and simple. The fading in the soft areas is not caused by sun fading. It is not physically possible for a horse to sun fade in those areas and not in the "normal" areas for sun fading. Those faded areas are the main, and definitive areas, that a horse carries At.