I remember a key plot point in Trials and Tribbleations was the fact that the Cardassians were returning the Orb of Time to the Bajorans. One thing struck me, though. I wonder why they didn't use it to try to alter time in their favor? Here are some theories I have on that:
- Ignorance: I recall in the DS9 series there seemed to be a bit of ignorance among the Cardassians about Bajoran culture and the like. For instance in Tears of the Prophets, when Dukat mentions the Pah-Wraiths: "We had an ally we never even knew we had." On that theory, I think the Cardassians didn't care enough to learn about the Bajoran faith and thus had no idea of the power they had with this particular orb.
- Divine Protection: Perhaps the Prophets prevented the Cardassians from being able to utilize the orb in that fashion, because if they did alter the timeline in their favor, that would mean possibly their destruction (advertent or not) at the hands of the Cardassians. And the Orbs themselves seemed to have an intelligence all their own, permitting travellers access at their own whims.