It's a short thread, you will find my posts there easily:
I detailed everything there and in the next-gen thread too but here I rewrite the reason quickly.
There is 100% not a single single sign for lightbar in the back of the controller from both the patent and now the leaked photo and the USB type C is taling its place.
The purpose of the lightbar to start with was to be tracked by the camera and it's normal position must be the back of the controller, and on DS4 V2, they just made a little line transparent at the top of the trackpad to show the light from the LED which is stuffed inside the controller and revealed from the back.
What's the purpose of stuffing an entire LED light inside the controller now if it gonna be masked by the back, not being read by any camera or otehr device and just leave small transparent line to show it? Why such waste now for no purpose at all?
There is no lightbar in the controller and this is a fact.