The key clue around the cabin that remains unresolved is the person on the motorcycle delivering food and water. It's entirely uncertain whether that person is the deceased thug. He doesn't own any vehicle under his name, and his family has been contacted and their information verified, confirming that they don't have a motorcycle either. Although Jimmy and his team heavily suspect it's him, there's no direct evidence, so they have to drop it for now.
The family of the kidnapped Amy also arrived and met Amy at the hospital. They didn't leave directly to return home because Amy, as a victim of the kidnapping case, is crucial for the follow-up investigation and evidence. They have to temporarily stay in Kalin City, waiting for the FBI's investigation.
