I read the whole topic and read some lines I really don't grasp.
What happened, by the look of it, and I race myself, is that FJ was fully using DG's draft. DG launched and immediately looked down / under his shoulder and saw FJ coming left. DG decided to slowly close the door and keep closing it. You can close a door if that door wasn't open in the first place. In this case, there was plenty of legroom until the crash and DG deliberately kept closing.
If some on here argue that there have been worse sprints by other riders, but I have yet to find one where the rider is so deliberately trying to block a rider up until the point of crashing, taking into account the ridiculous high speed that really didn't leave any margin for error.
There are some sprints that are a tiny bit worse as in 'trying to cause a rider to crash' (I refer to Cavendish vs. Veelers), but none with the combination of deliberate dangerous action at life-threatening speeds.
I remember all kinds of irregular sprints, but I really found none that was so bad. Even Abdoujaparov looks like an angel as he was mostly swerving in the middle of the road. Cavendish was maybe the worst of the last 20 years if you combine what he did on the track with his sprints against Haussler and Veelers. Stating that throwing a bidon by Steels was worse than DG is ridiculous. That is an act out of frustration and nowhere as dangerous as pushing a rider in the barriers. And stating that Demare swerved in Milano-Torino is ridiculous as well. There was no one blocked and that sprint was perfectly fine. Last, one commenter here suggested that if FJ choose the other side, he would be fine... Let that sink in. If FJ choose the right, he reckons DG would have swarved to the left. Go figure. That commenter probably never raced a day in his life.
I'm not going to speak about what should be done and who should be punished. It actually isn't any of my business. I only hope FJ will still be able to eat, smell, see and think normally, and if miracles happen, this young and prodigious kid can one day race a bike again, hopefully on the same level as before.