He hardly pressed in Real Madrid as well but we were a good team (particularly the midfield) that could cover for him, and we also had a better manager. I mean Morata was the one doing that type of thing, pressing and being annoying, it wasn't anything crazy but compared to Ronaldo and Benzema he was the Makelele of forwards for us.
But more than an issue about Ronaldo I see it as an issue with the recruitment. Cavani needs to play as CF and I don't know if it's due to his age he can't start every game but if that's the case then the team needs to get someone of a similar profile than can start all games and balance the forward line. I think someone like Raul Jimenez is the type of forward a lot of people want here but I wouldn't expect him, or Cavani, to score at the same rate or be as decisive as Ronaldo.