Let's assume that there is something in spiritualism and the 'other side' communication.

Why are we satisfied with the small fry who comes through and communicates? Why not talk to some big guns, Jesus, Buddha, Mohammed, Socrates, Plato, Karl Marx, Tolstoy, Maslow, Jung, etc. people who were, or were considered by many, to be experts in their fields?

Why channel an angel or archangel when there is any number of past human spiritual people, saints, popes, lamas, zen masters, etc. which should be able to give us some good insights, considering that they were here and now are there?