https://www.jwfacts.com/watchtower/mediator.php
It is common for a cult to claim their leaders mediate for the followers, as emphasised by leading cult researcher, Steven Hassan.
"Mystical manipulation can take on a special quality in these cults because the leaders become mediators for God. The God-centered principles can be put forcibly and claimed exclusively, so that the cult and its beliefs become the only true path to salvation." Combating Cult Mind Control, Steven Hasssan, p.202
In Christianity, Jesus is the mediator through which all mankind have freedom to approach God. The Apostle Paul puts it simply:
1 Timothy 2:5,6 "For there is one God, and one mediator between God and men, a man, Christ Jesus, who gave himself a corresponding ransom for all."
Jesus alone is our mediator and Paul does not limit who this opportunity is available to. In order to heighten their own authority, cult leaders disregard this concept when assuming the role of mediator upon themselves, using a range of explanations to undermine Paul's statement. With this in mind, it is important to understand the Watchtower Doctrine on the Mediator.