Here is my take, First thing i noticed is how simple he keeps his play, great technique, good at passing with both feet, and also his compsure on the ball very important asset for a midfielder, did see much from this highlight about his link up play and Movement off the ball but am sure he has that too. However I am more impressed with his tackling, he doesn't slide tackle rather just a simple out stretched leg does the job. Reminds me alot of busquets, i belive anyteam that gets him now have just gotten a world class player in the making. Give it 5 years this lads name will be everywhere.
He's a little bit stiff, particularly when turning, could do with a bit of hip fluidity, and a little hit of strengthening, but he has a creators mindset, solid foot manipulation, long legs and strides, vision he excels, I'd mould him as an 8 on the left hand side. It'll be interesting to see which nation calls him up. He's only 17 great Talent.