The 4th section (Follow Me) is not complete yet, I am developing right now. So you are correct, that is where I am currently working (you're not stuck ha-ha). There will be multiple endings to the 4th section.
Sections are entry ways, you will/should notice that the environment has changed from one area to the next. If that is not apparent please tell me so I can use lighting or some other aspect to make the flow better.
Also, 2nd Section will be modified as well.