What changed? The bikes changed, and even though both machines are supposed to be identical – the teams take meticulous care to ensure the set up is exactly the same on both the first and second bikes – there are sometimes tiny differences which end up having a massive effect. Marc Márquez had a great feeling with his second bike, and was quicker than with his first, while Rossi had exactly the opposite. He never really felt comfortable on the second machine, and had to let Márquez go.
In the press conference, he was very cagey about the possible causes, though afterwards, speaking to the Italian press he was a little more open. "I don't know the reason," he said. "Maybe I didn't heat the rear tire enough, or maybe the tires weren't identical." The opposite had happened at Phillip Island in 2013, where his first bike felt a lot worse than his second bike.