Ok, digested your last feedback and updated the cheat sheet.
I have also used two colors, to highlight the separate recording (orange) and live viewing (green) chains:
The number of questions in my brain is decreasing.
So hold tight a little bit 
The first buffer that arrives from the ffmpeg node (when starting a new stream) is smaller:
Is that the initialization segment?
And my two last questions at the moment:
- Why do you push two links to the dashboard (both mp4 and hls playlist). Isn't the playlist enough?
- Still not sure where the pre-buffer (number of keyframes) is located in this diagram, and what it exactly does
