He played a very impressive game. I wasn't convinced by him at all in the first half of the season. He looked very limited always playing strictly towards his left, weak passing/movement game, and his final ball was a constant obstacle.
Against Elche he was an entirely different player. His turns were great and he played with an awareness to pressure/space that I haven't seen from him, anticipating his opponents at his back and creating space with his dribbles on both his left/right sides. His first half in particular displayed a great maturity in passing and he was linking up well with Adama/Montoya/Munir and telling them where to position themselves. Did well in the fast transition counters we had as well (throughballs to Munir and Adama in the first half). The flair was an aesthetic bonus.
I hope his improvement can mirror that of Isco who had many of the same weaknesses as he did (too keen to go at it himself instead of creating space to pass/move, weak passes and dribbling with his head down, predictable, etc.). Isco had all of those faults and a low defensive workrate unlike Rafinha who defends with intensity. I do believe Isco is more talented but Rafinha can have a similar improvement and become a very reliable midfielder. His performance against Elche is a start, and with the way Lucho praised him I could definitely see him getting a chance against Deportivo as well. Now he'll have to perform in a different setting with better teammates but also having to support more dominant players than Roberto, Munir, etc. Hopefully he shows the same maturity and intelligence that he did against Elche.