Some notes for what characters will know:
Unless you intentionally play a character that is oblivious to a great extent, everyone is aware that Kallark is no more. Character may not know what he was exactly, some may think he was an Iottian, or Lyla's alter ego, but they all know he is gone.
Unless you are playing a character in denial, or some conspiracy theorist, you are even more likely to know Sutyr is gone. In fact, most would think he has been one for longer because his faith was driven out of many places as soon as he left the Counsil.