The final seat that appears to be open on the Formula 1 grid next season is at this year’s bottom team Sauber. Sauber will become Audi at the beginning of the 2026 campaign and that should make them an enticing prospect for any driver. However, driver after driver has rejected joining Nico Hulkenberg at the Swiss team in their final year on the grid before they become Formula 1’s newest works team. Audi have made sweeping changes recently to try and get the project back on track but that’s been easier said than done. Mattia Binotto witnessed Valtteri Bottas and Zhou Guanyu get left behind at t…