Question: are jellal and siegrain the same person?
Answer: Jellal and Siegrain are the same person. Siegrain was Jellal's hologram in order to become a council member and to persuade the council to fire the Etherion at the Tower of Heaven. Mystogan is Jellal from Edolas, an alternate dimension separate from Earthland. People from Earthland have doppelgangers in Edolas.