Star Trek story-on-the-fly about the Defiant?

Finding the gaps in Star Trek and creating stories in-between is one of the many great things about being a fan. Char and Tristan love being able to ask "What if?" and develop interesting stories around that question. This week we talk about the summer break between seasons 2 and 3 of Deep Space Nine. What did Benajmin Sisko have to go through in order to get the Defiant? Did he even want it in the first place?