Who is the copycat in the Hannibal series?

Yes, Hannibal is the copycat. This becomes more explicit later in the series, as it becomes clear that Hannibal is

taking details of existing cases from his access to FBI agents, and is committing further copycat kills.

The cinematography shows that this is what's happening. However in S1E10, Buffet Froid, we see Hannibal doing this.