I don't know if I like the fact that the "contagion" was self-inflicted. It kind of breaks the pattern of the "exile race was <REDACTED>ed over by the Dominion and fights back" now it's just "all these races were wronged by the Dominion and now want to fight them......and the Mordesh." They created a plague and the Dominion quarantined them, to...you know...save everyone else in the galaxy, if you're going to get pissed off at them for that you must be pretty stupid. Their backstory would work much better if they were offered a chance in the Dominion, declined it, and then the Dominion inflicted them with the contagion. Flows much better.