Carlos Sainz’s accomplished victory at the Mexico City Grand Prix has reignited the debate over whether Ferrari should have signed Lewis Hamilton. Sainz has arguably driven at a higher level than Hamilton this year. Both drivers have won two races, with Sainz also victorious in Melbourne in March. Hamilton won his home Grand Prix at Silverstone and then inherited victory in Belgium when George Russell was disqualified for breaching the weight limit. In the championship, Sainz is one spot ahead (fifth versus sixth), but the gap between the two is a hefty 51 points. He’s scored seven podiums to …