Agree. That in a nutshell was what I said in a previous game, with ball and without ball are different phases that people need to wrap their heads around.
I agree Lucho will try get forward as often as possible, that's his natural instinct. If you look at Ralaks though, Overmars is key to his transition to attack if not his main route. I would instruct him to stick to defending as there are plenty of outlets for EDogen's side anyway and Robben would beat Capdevila solo anyway.
Asking an attacking fullback to focus on defence is an indication you have the wrong man for the challenge faced though. Ultimately, playing Ferrara there was the right call.