Gatchaman Crowds Insight is the continuation of Gatchaman Crowds. On this episode, there's a recap on the entire first season.
So it's kinda lame that they bothered doing a recap on Gatchaman Crowds. But then again, it's "episode zero" which usually doesn't count towards in the story on most anime that does "episode zero". Other than that, I'll be looking forward for an actual episode. If you want to see a recap, I guess this episode is perfect for you. Overall, a boring recap.
Conclusion: A boring recap.