Can include Almeida, Nibali and Valverde in that too.
Giro-Vuelta double, a lost art.
Only thing I can think of is they're so far apart you need to rest up and do base training again while you don't have enough time to do waht you'd normally do in like the winter base training and that sort of stuff.
I still think it's coincidental.
Roglic will win the Vuelta. Unless he doesn't ride it. Or Pogacar or Evenepoel do.