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nick_h.
onyerbike
Bigham could have only optimised within the 3-4 Kask helmet options, sizes, visor combinations etc. The Giro might 10w faster but he can't wear it. So the short answer is maybe.
Specific to Ganna, he moves his quite head a lot so what's fastest on him isn't likely to be the perfect tunnel tested option in any case, but that'll be factored into the final choice.