Horner’s squad won twice last season - it’s lowest total since 2016, despite Ferrari dropping out of the battle at the front - as it had to address an inherent aerodynamic imbalance on the RB16, while the performance level of the Mercedes W11 gave the Brackley-based outfit an initial gap the rest of the pack that harked back to the early years of the turbo hybrid era. 
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Source: Red Bull: Last year's "lessons" key to 2021 success