You have to take eye witnesses descriptions with a brain of salt you can't trust them. You can trust what you have seen yourself and they are the important clues. We saw that redjohn wears a ring. We know he is quite tall. We know he is naracistic. We can trust Jane's account of him. He is a show man a show off who has a fondness for Jane. He is in a position of power ...that only leaves one person. Rewatch his scenes and look at his behavior .It makes Perfect sense. Hellers descriptions aren't great either but he is correct on two of them. It's not the picture I have chosen though.