The big question coming out of the Clasico was whether Xavi would run back the new formation that yielded mixed results against Real Madrid.
Against Real Sociedad, the manager went for round two, but the outcome was in many ways the inverse.
Barca went from bad result, in spite of a solid performance, to good result, in spite of a bad performance.
Now we have more data to go off of in analyzing the three in the back system, and whether it makes sense to continue down this path in La Liga, and with the final group stage games of the Champions League coming up.