If I understand you correctly, you're saying that the Watchtower Society is the narrow gate as these are those who you refer to as "Jesus teachers". There is only one mediator between God and men and it's not the Watchtower Society.
1Tim. 2:5 For there is one God, and
one mediator between God and men, the man Christ Jesus;
Salvation does not come from the Watchtower Society.
Acts 4:12 Salvation is found
in no one else, for there is no other name
under heaven given to mankind by which we must be saved.
We don't have to go through a manmade organization that claims to be the narrow gate to get to Jesus and to the Father. Eph. 3:12 In him and through faith in him we may approach God with freedom and confidence. 18 For through him we both have access by one Spirit unto the Father.
1 Peter 3:18 For Christ also suffered once for sins, the righteous for the unrighteous,
to bring you to God. He was put to death in the body but made alive in the Spirit. Rom.5:2 By whom also
we have access by faith into this grace in which we stand, and rejoice in hope of the glory of God. Heb. 4:
15 For we do not have
a high priest who cannot sympathize with our weaknesses, but One who has been tempted in all things as we are, yet without sin.
16 Therefore let us
draw near with confidence to the throne of grace, so that we may receive mercy and find grace to help in time of need.
John 14:6 Jesus answered, "I am the way and the truth and the life.
No one comes to the Father except through me. Heb. 7:25 Therefore he is able also to save them to the uttermost that come unto God
by him, seeing he ever lives to make intercession for them. Therefore Jesus is the door and the gate and the only way to God. Jesus is available to everyone and there is no manmade organization that can block or change that.