"Trust, but look for the exits."
The Jem'Hadar ship was clearly built for battle, not for comfort. No chairs, no Sickbay, no replicators and no viewscreen.
But it had ready and willing Starfleet officers who were determined to succeed at their mission, no matter the cost.
And one reluctant Cardassian, along as a "guide."
On the bridge, Sisko watched Garak out of the corner of his eye. He had no choice but to trust the Cardassian; if you couldn't trust your crew, you were doomed from the start.
Nevertheless, there wasn't any harm in keeping a phaser trained on him. Covertly of course.
Just in case.