I agree with you 100%. I see nothing about the GB4 victims bodies that points to rage. LISK is in control of everything, imo. He picks his victim carefully according to type, he acquires them through a routine of sorts, he somehow inspires their trust, and then he strangles them. He also doesn't just dump them...he wraps them, intact, in burlap and then places each body very close to the next victim. He also likes to play mind games (when drinking?) with the victims loved ones. We see none of this in Bittrolff. Bittrolff is a rapist/murderer with rage issues. That much is obvious by looking at the condition of Tangredi and McNamee. I don't think he carefully selects his victims, or even considers that part of the game. He's spur of the moment, imo. See a victim, pick her up, rape her, beat her, strangle her, and then just dump her right then and there. Doesn't sound remotely like LISK, imo. In fact, it really doesn't sound like ACSK, but at least we have some similarities in those 2 cases.