What are talking about? A guy who is good at playing lone DM can't play double pivot?
No but the requirements are different. We have been looking so long for a lone dmc to balance the midfield trio.
Now with a double pivot profiles like Pedri and Gavi will work better in the double pivot than at DMC.
Zubi played double pivot alot in Sociedad so there is no doubt he can play the role. But the urgency to have a midfielder for double pivot is different to that of a DMC in a midfield.
Now if/when Flick goes and we revert back to a 433. Then that is another question.
Personally I have no qualms about the Olmo and Nico deals together as the problem with the squad IS offensive quality. It's overly reliant on a 16 year old. Olmo and Nico take that pressure off Lamine (and Raphi).
My bigger issue is that we could have gone for a ton of midfield options cheaper than Zubi that would benefit the squad. Thuram went for 20m, the lad that name escapes me who went to Porto for 8m, etc.
But saying that, I have high expectations in Bernal. And in his paritcular example, his profile is way more suited to a double pivot than either the DMC in a midfield trio, or one of the central midfielders in a trio.