We don't know, but that's the rumor spreading in the paddock.
Under James Key, McLaren’s designs lacked Red Bull’s aerodynamic cohesion. The MCL60’s mid-2023 upgrades (Austria, Singapore) improved pace but didn’t match Red Bull’s RB19 stability. Marshall’s 2024 arrival, with flexi-wing expertise, addressed these issues, and they dramatically improved stability and tire management.
Rob Marshall, who joined McLaren from Red Bull in January 2024, brought expertise critical to McLaren’s 2024 turnaround and 2025 dominance. His flexi-wing reputation is well-documented. McLaren lacked a cohesive aerodynamic philosophy pre-Marshall. The Race notes McLaren’s 2024 Miami upgrade, including a flexi-front wing, transformed balance, enabling Norris’s first win and the Constructors’ title.
Horner said, “Don’t underestimate the regulation change of race nine, you know, with these front wings. That could be a game-changer.” This hints at McLaren’s flexi-wing dependence.