perhaps Akka is being sent dreams, but not by Kellhus?
i think that the dream/vision that Kellhus has on the circumfix was sent by Moenghus, so maybe Moe could be sending Akka the dreams? (to me, the end of TWP is so miraculous there's no way it couldn't have been orchestrated via Psukhe)
one point in favor of this, i think the only example of dreams being 'sent' is from Moe to Ishual. all other instances are people like Akka having a dream (seemingly) on his own, or two sorcerers meeting in some kind of dream space.
what i'm getting at is that perhaps only psukari can send dreams without leaving a mark. in TDTCB, Akka does not want to use compulsions on Inrau because it would leave some kind of residual mark that would reveal Akka's tampering to the college of Luthymae. if Akka is being sent dreams by a gnostic sorcerer, then perhaps it would be revealed to him or Mimara. maybe Akka is too blasted for it to make a difference, but there you go. Moenghus would be able to send dreams hither and thither with the recipient none the wiser.
P.S. on the crackpot extreme, Moenghus + Cishaurim + 30 years = subtle manipulation of every great person in the 3 seas? (if and only if sending dreams is not limited to personally knowing the place/person that you are sending too -- i think this is possible, think of when the Cishaurim warped into the Scarlet Spires, presumably, they had never been there before; proof that the Psukhe is greater than the Gnosis?)