Borneo Birds

I took the picture of this White-throated Fantail in Mt Kinabalu so I suppose it should be Rhipidura a. kinabalu but I really have a problem with the white throat.  By all accounts it should have a white throat and chin but all the birds of this species that I have seen seem to have black chin.  Perhap my vision is blurred by the constant motion of the bird but have a second look at the picture.