These are anomalous footballers. Rodri and Gvardiol are as good as they are because of what they offer in their primary roles first, before you add the anomalous qualities on top.

FBs play like wingers situationally, but still primarily play like FBs. Don’t over complicate it.

Not true really. Football is score goals, concede not many. Attackers first contribute to the former, defenders first contribute to the latter.