What is the need for a seeker to interact with a teacher in physical proximity? Some teachers say that a guru is necessary for silent transmission. What do you think?

There is only one guru, and It is within you. All things are born from, created by, and die back into the Innermost Lord of All, which resides in all things, times and places; therefore is always present. Surely, silence is all around you and therefore transmission will take place as soon as the mind becomes empty so ready to be filled.

Your devotion to not grasp the objects of the mind brings down the grace that imparts perfect knowledge. Sometimes this will manifest as a physical teacher and sometimes not. Nevertheless, all great understanding is done when an individual reaches into the inner dark and retrieves light. With all the energy you can invoke, mount the seat of devotion, and snap the reigns of inquiry; and like a laser dive inward!