Williams were poised to pull off perhaps the biggest coup of F1’s silly season by signing Carlos Sainz. But now it looks as if the Spaniard may be inclined to move elsewhere. The F1 paddock was ‘certain’ that Williams were going to announce Sainz as one of their drivers for 2025 at his home race in Barcelona last month. But he hesitated late on. James Vowles is looking for a partner for Alex Albon, with the struggling Logan Sargeant set to leave F1 and join IndyCar. Sainz is arguably the top free agent on the market right now after racking up three wins and 23 podiums during his time with Ferr…