You are right.
Basically at this point people should brainstorm to fit all the pieces together (is much easier live), it is possible to ditch a detail if it doesn't fit, but I find more interesting trying to fit them all.
I see this: instead of being the first follower of Erytrxalrkrrqwt, Circl is some kind of gangster, with no interest in the supernatural, he searches only mundane profit, Erytrxalrkrrqwt is an affiliate of his/her, it is useful because its powers are helping Circl to gain power in the outlaw world.
For Erytrxalrkrrqwt the relationship is also beneficial, because, thanks to Circl's contacts/resources she can find obscure tomes and strange people...
The extradimensional nature of Erytrxalrkrrqwt could or could not be known to Circl, depending on what we think is best.
I can go further, but I don't want to build the entire setup myself.