I was thinking the same yesterday in the 2nd half.
It seems that he isn't that good when we play at home against parked buses, he is then somewhat lost as a Cm.
But in a match like yesterday with a lot of counters and turnovers on both sides, he is much better.
Even though, he wasn't "all over the place" yesterday and he wasn't leaving a giant hole behind his back, like he used to do in majority of previous matches.
Imo, when we play against a bus, he drifts to a Lw or Rw or to a Cf too often and then we play 424 against parked buses and our midfield is somewhat lost (especially when we lose the ball and no one can collect loose balls in a midfield area).
In a match like yesterday, with lots of turnovers, he didn't have time to drift to attack or Lw too much, but instead he was running from a box to box a lot, and played much deeper, close to Busquets.
That way he didn't turn our 433 into some hybrid 424, but he kept his position in a 433, and he was quite good in that role, especially in the 2nd half, as others have mentioned.