John 15:1
John 15:11“I am the true vine, and My Father is the keeper of the vineyard.
Read at the level of the imagery — Christ is the true vine, the Father is the cultivator who tends it — without the architectural implication for ecclesiology. The Watchtower's organisational model inserts a third tier: the Governing Body as the channel that distributes spiritual nourishment from the vine to the branches.
The architecture of the metaphor matters. Jesus says "I am the true vine; my Father is the cultivator." There are two roles in the metaphor and neither is a mediating organisation. The branches are the believers, attached directly to the vine. Pair with ("come to me"), ("one mediator between God and men, a man, Christ Jesus"), and ("approach the throne of grace with confidence"). Every believer has direct access to the vine; no organisational trunk has been inserted between Christ and the branch.