So, the question is, how will the story be impacted by the revelation that the "Thirdie" murder victim (who wasn't Sean Bean, but he's coming) was an informant for Wilford?
With that said, the whole lost cattle discussion closer to the episode's end likely hints at way more problems happening within Snowpiercer's universe than the ones we know about.
It's a bad situation, but as Cavill said, none of the passengers needed to know just how bad it was just yet.
The Snowpiercer is like a very delicate house of cards (or perhaps a domino line).
Perhaps it's someone from the First Class section?
Maybe it's someone looking to make a power play that will throw this train into even more chaos in the coming episodes.