Heh, who's to say there was only one Changeling on Defiant at the time?
Ooh good point! That would have been a more ominous ending too. Although my boring thought was that as we saw that Changelings were on Earth during Homefront/Paradise Lost, it would be easy for one to get access to Starfleet records.
I like this episode. I think the wirters did well with it considering their plans were changed by Paramount.
I sort of wished we could have had what the writers intended for season four. Don't get me wrong I love Way of the Warrior and Worf, and I loved that the Klingon/Federation conflict is a result of Dominion meddling. It all links up so well in season five, but I can't help but feel we were robbed of something that would have developed the Dominion in a different way.
It's hard to imagine what would have replaced season four though. It was a very consistent year, with lots of good episodes.