There were too many open questions there. And why did they choose Sisko as their Emmisary? Why him, from trillions around the galaxy? Why not a Klingon from Qo'nos, or a Cardassian, or a Tzenkethi or a Talarian, or a Romulan?
My own theory to this is that Sisko only became the Emissary after he met the Propehets in Emissary. Once he explained what linear time was etc, the Prophets then created Sisko. As timelines don;t mean anything to them.
Also telling the Jem'Hadar to sleep really wouldn't work!