Carlos Sainz is once again attracting plenty of attention ahead of the Hungarian Grand Prix this weekend. With exactly half the season gone, he still hasn’t chosen his next team. Sainz has known since the winter that Ferrari are signing Lewis Hamilton and letting his contract run down. But rather than quickly resolving his future, he’s opted to play a high-risk, high-reward waiting game. The Spaniard is banking on his stock being so high that multiple teams will wait for him. And it seems to be working, with the bottom five in the constructors’ championship all yet to confirm their line-ups. O…