I think that even if Arthur stays as pure midcontroller, he's still an asset. He allows Messi and Coutinho to stay put in their starting positions in the final third, because they know that somehow ball will come to them sooner or later. Busi and Arthur will guaranty that. Previously the whole burden of this was on Busi, because no Raki nor any other of our makeshift CMs could do that. I think people who underrate Arthur's contributions don't understand Xavi's influence on our past football either. They only remember piercing passes, but what made Spain invincible in past decade was his presence in the CM mastermind role, the chameleon eyes octopus (tm)Roy Hudson. If Artur can bring even only this aspect to out game, it's already great. I have no doubt that he will become more assertive with his passing as he grows into the starting line up and plays regularly. Even against buses his ability to wiggle around and open up passing lanes willbe great relief for our attacking daggers. Raki, with all due respect, can't do that and our other mids are mostly attackers, who also need someone like Arthur or Busi to deliver ball to them in final third. When they need to come back deep to have a lick of the ball, we lose all positive dynamic of our offense.
I only hope that he doesn't go the usual brazilian route of complacency. but he seems to be a very serious guy like Dunga was as a player.