This discussion may contain spoilers!
I think that Bluebeard is the Tweedle's boss, why? If you play nice with him in the interrogation Bluebeards begin to hit him and he says "What the Fuck" that could mean that he is surprized of his boss hiting him
and maybe that explain the episode 4 screen:
So what do you think?
EDIT:I didn't find any big image so thats it