Carlos Sainz is leaving Ferrari, the team currently third in the constructors’ championship, to race for Williams, who are second from bottom. He lost his seat with the Scuderia after Lewis Hamilton became available for 2025. Sainz would have expected to remain at the front of the grid. There was a clear vacancy at Mercedes following Hamilton’s exit, while Sergio Perez was out of contract at Red Bull. And when he won the Australian Grand Prix in March, his stock was at an all-time high. He was the only non-Red Bull driver to win multiple races since the middle of the 2022 season. But that wasn…