Aston Martin's Mike Krack insists that the signing of Fernando Alonso will generate a positive 'spark' within the team. Following Sebastian Vettel's retirement announcement earlier in the season, Alonso was swiftly confirmed as an Aston Martin driver for 2023, making the switch from Alpine. When asked about the impact Alonso would have on the Silverstone-based team, Krack pointed to an example of the 41-year-old's determination in the 2022 season. "I think with Fernando, I always hold up this picture of the Mexican Grand Prix, about his frustration of not having finished seventh," Krack explained to media, including RacingNews365 .com .…