According to Osho, in the fifth stage you won’t need his presence at all: after the third stage even “you” are no longer needed; the fourth arises, and then the fifth follows by itself, like a shadow. No medium is required. If, upon entering the fourth, you still feel a need, his presence can be invoked anywhere by remembrance, even receiving answers inwardly beyond time and space.
Give your all to the first three stages; after that the path finishes itself—and if you reach the fourth and need help, just remember him and guidance comes from within.