You see thats the point. Robben was great at Chelsea and Madrid but neither of the medical staff there were skilled enough to find a concept for him, so he couldnt play for a long time at constant level but in the last 4 years he was always one of the best wingers in the world after Messi and Ronaldo. Kroos is killer in every holding midfield and shows this for years now. And Müller is Müller. His strength is that you cant sort him into a category. He is a player running into spaces that nobody would expect and thats an unique skill. He is no striker, true but the closest to a false 9 besides Messi on a tactical level.
I know that neither of those have that marketing value or huge Nike or adidas deals and lack the swagger of fancy over inflated pseudo stars, but on a football level, every club in this world would want them.