I now understand why people say Minerva's Den is such a great DLC for Bioshock 2. In this one, we are playing as subject sigma another big Daddy BUT it was revealed to us at the end of our playthrough that we were Porter all along. It actually did say that we were Porter based on one of the audio logs you can find and you listen to in the game but it absolutely flew over my head because why would Porter be a big Daddy now if he was still speaking to us through radio comms, and that's where the Thinker comes in. With it's function to copy a person's personality and the way they talk was well executed to the storyline telling how the Thinker was impersonating Porter all along and that it was speaking to us as if it was really Porter but the truth is that we "Subject Sigma" is Porter from the beginning. It was actually pretty smart and I liked the twist. Lastly, It absolutely crushed me to listen to the last audio recording we can hear at the end part of the game where Porter had the Thinker replicate his deceased wife Pearl and speak to him as if the Thinker is his long lost wife. I felt Porter's pain when he realized that it wasn't right and tried to immediately stop the Thinker from proceeding further of the Thinker speaking to him as if it his dead wife. You know same thing is possible in today's modern world with Artificial Intelligence, you can literally make something like the Thinker and possibly hurt yourself emotionally by creating an Ai replica of your loved ones. The ending cutscenes Porter was telling us a valuable lesson, It is to let go.