Sisko is stuck outside space-time on Bajor. He does not know if his crew and his family are alive or if his universe even exists beyond this plane. All Sisko knows is that he must stop Lore before everyone and everything he loves is destroyed forever. To do that, he must build the Orbs of Destiny. It all comes down to this. If theres any hope for a future, the Prophets will reveal it now.