Here are some facts.
- Aleix Vidal is out for the season.
- Sergi Roberto is not in good form, and seems mentally fed up with the right-back position.
- Barcelona need a huge offensive display to pull off a miracle comeback against Paris Saint-Germain in the UEFA Champions League
- Barcelona have 3 starting quality centerbacks.
- Barcelona have a glut of decent-to-pretty-good midfielders, but no one outstanding candidate besides Sergio Busquets and Andrés Iniesta.
With these facts, isn’t three at the back the logical conclusion?