Kroos is quality. Great passer and has quite a hammer in his feet too. Can't imagine he will function well in Madrid's midfield though. With the combined muscle power of Modric, Kroos, and James, the three of them wouldn't be able to take candy from a baby.
I recon same thing would happen if he came to United. You just can't field a midfield made of paper and hope to survive in modern football.
Herrera is a lot more combatative and even in pre-season friendlies looked like a guy who won't back down from a fight.
Not sure why Madrid are playing with midfield of Kroos and Modric. Even on FM it won't work. Should play midfield 3 but if they do they have to drop one of James, Ronaldo and Bale.