How do you suppose the sketch should be done hair wise when BG is wearing a hat in the original image that Libby got a shot of??? What if he's completely balded and or full haired and a wrong representation is put out there?? LE doesn't know and neither do we.... It sounds like you will have to accept that this is what it is....
So here in lies the problem for me...IF BG was wearing a hat when witness saw them they should describe the hat. If he wasn't wearing a hat they should describe and draw him without a hat and describe his hair.
The people that KNOW him will know what he looks like hat on hat off.