His usage of the ball; the timing of his passes; the quality of said passes; the way he moves into open space after playing the initial pass, all things that suggest he is going to be sublime in an elite team.
His reading of play and manipulation of it really is special. Nevermind the dribbling, assists or goals; his fundamental understanding of the game and the way he plays across so many positions on the pitch will make him an exceptional cog in any functioning team.
Put him in a side with the equivalent guile and technical ability and he will be unplayable. I'm glad he and Messi play the same position and that his value should put them off, because he looks like the perfect cohort to sync up with Messi and Barca and be an absolute menace.
I think our side, with the attack we're assembling, can provide the superfluous football that someone like him will absolutely thrive in.
He's an exceptional talent.