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You could be right, although from the right turn at Lauteret to the top of the Galibier is more like 9k. This also ignores the 'interesting' descent to Plan Lachat, a possible banana skin. It is likely that at least one GC contender will lose out. The cumulative effects of the earlier climbs can't be ignored, much of which depends on how the GC teams ride from the start.
With so many variables, not watching from the start would be a massive own goal.
Today is coming down to final 6km of climbing, sorry to everyone who think this will be a banger