I think that the Vril are involved here, if we do a simple Google search for Vril we are taken to a wiki page that contains this text: "Vril, the Power of the Coming Race is an 1871 novel by Edward Bulwer-Lytton, originally printed as The Coming Race. Many readers believe that it is account of a superior subterranean master race and the energy-form called "Vril" is accurate, to the extent that some theosophists accepted the book as truth. A popular book, The Morning of the Magicians (1960) suggested that a secret Vril Society existed in pre-Nazi Berlin."
Extracting some text from that passage it appears that the Vril are a master race that are in ENERGY FORM, this could suggest that Avagadro may be a Vril, much like the Minions in Die Rise (due to their electrical teleporting powers)
I don't think Richtofens is the only voice that Stuhlinger can hear.