Because he is the best they have. It's simple isn't it? Need I also point out that in 23 A. Yates came 3rd whilst being a domestique? And in 24 he was 6th and Almeida 4th? That's unheard for domestiques.
That's my point. They're all doing the same stuff/on the same program, Pogacar is just way better. What Almeida or Yates did isn't even comparable to Poga's performance this season.