How does that even work, anyway ? They removed all the borg implants... and if they didn't, well that's very worrying. Considering the way the movie tells it, and Wolf 359, I find that very unlikely. But then Trek always plays with the passage of time a bit. That's speculation. They were pretty quick to send one once they became aware that the Federation existed. And there's an entire quadrant full of species that are technologically incapable of resisting a full invasion. Why give them more time to develop defenses ? And I'm watching that movie in 2 minutes !