The Vuelta is a consolation prize for Rog. He'd probably trade at least 3 of those Vuelta wins for a Tour, and maybe all of them.Crazy how Rog always comes back stronger after injuries. Some cyclists go to altitude to peak, Rog just gets injured. The end results is he now has 4 Vueltas and 1 Giro with a Tour podium. All that in the last 5 years.
I don't know if you can say he's stronger after injuries, more like he gets time off to keep training in a controlled way while his rivals are beating each other up on the racecourse.