Regarding the Raksasa - we don't know if the fallen were involved. We do know that fallen were in the middle east (Not far from the Raksasa's stomping grounds) in Small Favor (I think it was SmF). So, there could have been some rileing up there.
That was Skin Game, much later. The Rakshasa has been mentioned twice; once as a thing the Council Handled (cristos distinguished himself then) and once as an offhand mention of a normal case that Capt Jack's office was handling. Still doesnt line up chronologically, though some have specualted that time on that side of things might be wonky.
Also, a Rakshasa is a hindu thing so a decent distance from Iran. Unlike a bunch of other things in the Hindu side of things, it does not appear that the Rakshasa has the persian roots that typically connects it to iranian regions
As to how they are connected.... isn't Capt Jack and crew part of the Cosmic Defense Force?
OOOOH, I see where I lost you. No, what I meant by the Cosmic Defence Force is all those super-powerful beings that seem to have been given specific roles in the defense of the Local Universe. In my mind this includes Mab/Winter as the Gate Guardians, Vadderung as the Plan B Preparation force for the inevitable day that said defenses fail, and Hades as the Keeper of the Armory.
While I would expect anyone being managed by Uriel to have a similarly critical and/or specific purpose, we have no idea what it might be so Im not really including them for now. I also tend to view Uriel as operating on a separate/higher plane, one with more Multiversal awareness (because I think there is only the one Uriel across the multiverse).