Bellingham kinda isn't a midfielder right now, more of a false 9, but sure. Still I wouldn't say he is as consistent as Gundogan or Rodri. That why the only two I really see as world class right now are these two.
Kroos isn't world class anymore, dude doesn't have the stamina to dominate. There are also players that will become World Class, but for that you have to show your worth on the biggest stage. I wouldn't say Pedri or Musiala are world class yet, but they are on the right path.
It's just funny how you keep on riffing on Barella. He is our best midfielder even if he isn't world class. He is one of our most important pieces for sure.