^Sisko perhaps, but not Dax especially in 1993. Bashir in one of the sickbay scenes throwing wisecracks at Data would been cool.
And the fact nobody from the DS9 cast was a part of the plot was a great thing. Just because the Enterprise went to DS9 doesn't mean Sisko, Kira, Dax or Bashir has to be part of the plot. Ships come in and go. The senior staff of those ships probably don't often interact except for asking Kira permission to dock or leave.