A major domino fell in the F1 driver market last week. Nico Hulkenberg is leaving Haas and heading back to Sauber, set to become Audi in 2026. Hulkenberg becomes the second driver to commit to a new team for next season. The first, of course, was Lewis Hamilton, who’s joining Ferrari. It’s bad news for incumbent duo Valtteri Bottas and Zhou Guanyu, at least one of whom will now lose their drive. Bottas is believed to hold a slight edge over his teammate as it stands. But both of them could be out of a seat as Audi continue to prowl the market. Their top target is Carlos Sainz, the victim of Ha…