Sastre managed to win a Tour. Not sure Mas will especially having to compete against Pogacar and Roglic among others but he has progressed. I guess most people didn't expect Sastre to win the Tour and both he and Evans won it late in their careers.Mas will probably be a Tour-Vuelta lifer like Sastre, doing both races in great condition and riding for top 1-5 the next many years and not be seen that much outside of those races. But they should definitely look at this buildup - I assume the Tour is still the most important race for the team, so if youd choose between what race you'd peak for, it should be the Tour and try to do the Vuelta at 95%. This year its the other way around.
Dont know if he should contest Catalunya and Pais Vasco, but he should definitely be better at Dauphine