It's pretty simple really.
In the WU of the night after Adam was lynched (or around it) there was an Illuminati WU, and this was after TAC died.
After the Illuminati public message who was at the forefront of mentioning that stuff (kek) when the Illuminati message came out?
Someone mentioned that it was possible Mafia could copy abilities from dead players way before and recently there was a discussion that a certain someome could absorb abilities from who they kill. Which is more likely since there are other roles that have abilities related to the players that died.
And that Illuminati lynch ability was used to lynch Drago and save Adam. So adding this all up who is it and whose faction is he part of?