By Daniel Moxon Toto Wolff admitted it is fair to question if he is still the right man to lead Mercedes after a dismal Melbourne race for the Silver Arrows. Both Lewis Hamilton and George Russell failed to finish Down Under. An engine failure ended the seven-time champion’s day after 17 laps, and Russell crashed while trying to overtake Fernando Alonso at the end. Mercedes have just 26 points to show for the first three races, while Hamilton has suffered his worst ever start to an F1 season. He has only eight points, having finished seventh in Bahrain and ninth in Saudi Arabia. Wolff has been…