So now it's a thing about Busquets having too much power on Barcelona? I think you're stretching it a little bit to far to excuse the fact De Jong hasn't performed like he was expected.
He has actually performed reasonably well in the position he is playing.
But quite obviously not at the level he is for the national team or prior when playing in the role that's suits his skillset most.
You brought up Modic and Kroos and they both had the same issue at Madrid.
Busquets has a lot of power yes, but he is also a very good player, actually its just not a very well thought out signing from Barca, if they had no intention of phasing Busquets out of his role
A similar thing happened with Kante at Chelsea under Sarri, it would be like City signing Declan Rice and playing him in front of Rodri and expecting him to excel at being more attacking