Eric showed more than Araujo recently in form so I think this is the correct decision...
And when you play with four at the back, it just sounds and feels strange to field four central defenders. I always thought it was just going to be a change in the tactic with three at the back and wing backs Raphinha and Yamal with Lewa and Ferran up top or we have to start Martin...
And having always played four at the back I think this was the better decision and if it goes horribly wrong we can always switch at half time.