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Agreed, but there's two of them and two leaders, assuming Kruijswijk is riding to support Dumoulin and Roglic, so I still think they are at least one rider short to do the grunt work on the non-GC days.
Look at Ineos, they will usually take Rowe plus two others, this year it was Van Baarle and Moscon, who can do that leg work. They also are able to take Kwiatkowski and Castroviejo, who are useful across all terrains. Personally, I think that Jumbo-Visma team is too mountain oriented, but the course next year looks like it could have more GC days than recent editions.
Martin and van Aert are worth quite a lot on flat stages.