Why not Ramirez?
I doubt Scolari is bold enough to use David Luiz in the midfield and Dante as CB
Ramires, Fernandinho and Paulinho have all struggled in that role when tried there in previous matches. All are more box-to-box midfielders than destroyer types and struggle to shift back into defense as Gustavo does to protect wing backs.
I don't think Scolari breaks up the Luiz-Silva partnership defensively. They have been a rock for Brazil. Too valuable to break up.
Apparently, Scolari trusts Henrique. Coached him at club level in Brazil. Prior to tournament, said Henrique can double up as 4th choice CB and 2nd choice DMC. So Henrique will likely be the one that gets the role and responsibility.