USS Defiant in FIRST CONTACT??
firstly, I know having Worf command the Defiant in the battle with the Borg in FIRST CONTACT was "because the plot required it", rather than have Sisko in command and therefore either be beamed to the Enterprise in a coma (an injustice to the character) or have him in the movie (too complicated).
what I am curious about is there an "in-universe" explanation as to why Sisko is not commanding the Defiant?
surely he wouldn't pass up a chance to fight the Borg?
was Worf already near Earth on another mission at the time?