It is possible for the EU to both have a democratic deficit, and for the completely opaque and unaccountable process for choosing the head of the Commission to be a part of that. Bear in mind, the EU Parliament is not a real parliament, so it does not improve things much when the 'spitzenkandidaten' is selected. That's how Juncker happened, a literal alcoholic. EU always ends up with failures at the top, it seems to be an unwritten law.