So far, every thing I have ever read about the Mechanicus and its organization is that its ruling priesthood consists of three kinds of tech-priest: Magos, Genetors, and Artisans. However, Genetors are often referred to as the Magos Biologis. Wouldn't this make them part of that first category?
Also, should Explorators and Secutors be considered to be part of this ruling hierarchy, or are they separate camps of the Mechanicus which Logis, Magos' and Artisans could be a part of? Honestly at this point I'm considering turning the title "Magos" into a title for any high ranking Mechanicus, so that the "ruling priesthood" consists of Explorators, Secutors, Artisans and Genetors and that any of these can reach a level of enlightenment and knowledge and further be classified as Magi. IE: Magos Explorator, Magos Secutor, Magos Biologis, Magos Metallurgicus, etc.
Sortof like the Catholic Church in a sense, in that there are orders such as Jesuits and Dominicans, any of which could become a Bishop.