The guy is fit. Tour de Suisse did him well, he was performing better by the day and has been training with Valv recently, his idol! I have no doubt Betancur gonna be good and I have no problem selecting him over Moreno, who did well recently, (but Route du Sud..) or Fernandez who hasn't done much of notice honestly.
Castroviejo is one of the best arllround domestiques in the world and is w/kg is quite good being a time trialist and all, he can climb very well on his day. I dont expect much out of Amador in the mountains. Jesus Herrada is a good allrounder and can climb decently, but he really isn't your typical domestique. He is at his best as smaller stage races, gunning for victories and even GC by being a good time trialist and pretty explosive (remember his win i Dauphine).