Icheb is reunited with his parents, and Seven is cranky about it, as her maternal instincts have been awakened and she thinks that Icheb’s parents are a bunch of big stinkies. The Star Trek: Voyager Rewatch manages to avoid Chucky in “Child’s Play.”
The pathogen Icheb creates has already been proven not to work beyond a single Cube. All the Borg did was cut that Cube off from the Collective. Plus, it’s the Borg, whose entire schtick is assimilation and adaptation. The one consistent thing about the Borg from when we first met them way back in TNG’s “Q Who” is that the same trick will never work on them twice. They scanned the Cube Icheb and the gang were on and cut it off from the Collective, but I find it impossible to credit that they haven’t already long since adapted to that pathogen and would’ve been completely unaffected by it this time. And this is something that the Brunali should have known, having dealt with the Borg, y’know, a lot.