The track layout leads to an issue with the way pit out is. The rider exiting the pits is going much slower, Marc coming down the straight was no where near Zarco when Zarco left the pits. But once Zarco left the pits he could not see Marc, or any other racers, coming down the straight. All he could do is stay wide off the line and allow the racers on track to go by. As long as they did that nothing was going to happen. But Marc, who could clearly see Zarco and knew he was there, pushed the front into that corner and wrecked. There was nothing Zarco could have done that would have stopped Marc from crashing, and him being involved in Marc's wreck was really just bad luck. Zarco did what he was supposed to do, he stayed out of the racers already on track's way.
That said, Zarco had the correct view, it was a racing incident. Shit happens. The idea that the wreck was Zarco's fault, or that Zarco could have prevented it, is laughable. The only person who could have prevented that accident was Marc, the human bowling ball.