The reason JWs don't need Jesus as mediator is that Bunker elders's sweat atones for the sins of all JWs from the days of Russel until Armageddon.
I know a man who has a badly disfigured face and is now blind. He zoomed in on a Google Earth image of Bunker Elder's home. Bunker Elder was in the house praying at the time the satellite photo was taken.
The only reason Jehovah hasn't anointed Bunker Elder is that the angels all protested to Him, their unworthiness to have him in heaven in their presence.