Dear Professor Campos,
Remarkable work, indeed! I have two modest reflexions to suggest:
The Greeks of the 4th century BC celebrated the liberation of slaves by wearing a Phrygian cap. This came from the peoples of the Black Sea who did not practice slavery. So, the Phrygian cap predates the cult of Mithras.
Does the god Arimanius have a connection with Armenia, which came under Roman control in 74-63 BC? This is the region of the cult of Mithras, as shown by the bas-relief of Antiochus of Nemrut Dagi. However, Jesus Christ spoke "Aramaic," one of the languages spoken in this region. If we accept that the Gospels are texts of Mystery, would this allude to the cult of Arimanius from which Jesus would have originated?
I did a modest research on the migration of the soul in the cult of Mithras:
The catacomb of St. Marcellinus and Peter in Rome: Orpheus, Mithras or Jesus
Best regards
Dr D.Persoons