I think it might be Mas and Soler where the problem lies. They're good riders you want to have in the team but if they're your 2 biggest hopes for results apart from Valverde, you might end up on a level you're not accustomed to be on as Movistar.
As for domestiques, they've lost a lot of qualify ones over the last 5 or so years but they were still able to provide their leaders very good support. They still have riders like Cataldo, Erviti, Oliveira, Pedrero, Roelandts, Rojas, Sepulveda and Verona for all sorts of terrain for 2020. They'll be relatively OK on this ground IMO. The main blow comes from losing Landa, Quintana and Carapaz all at the same time and replacing them only with Mas, who himself had much weaker season than any of those.