The WMD idea might actually slot nicely into something we already established! The Blue Suns had possession of this nerve gas of sorts that they purchased off of the turian Seperatists on Taetrus before Nova raided them and stole the gas without realizing what they had. They sold it to a black market dealer I can't recall the name of, and the turians decided to track it and see where it all ends up for future raids. The Blood Pack could potentially be a prospective buyer and if Nova is offered an emergency contract to respond, it would work nicely I think, especially if the turians are straight up, which would make the Taetrus job much more appealing.