Corrected entry: The entire plot of this episode is to get the cure for the disease from Section 31. Why would they create a cure for a disease designed to wipe out the species it infects? The likelihood of needing to know it so they know what to destroy is odd, as only the Dominion would really want the cure.
Corrected entry: Joran complains once or twice about how Jadzia and Curzon buried his memories, but Curzon wasn't aware of the memories to bury them. We learnt in Equilibrun that the Symbiosis commission put a memory block on the memories, and only when the block broke down did Jadzia gain access to the memories. Joran should know this, as he would have access to Jadzia's memories of this event.