Has already equalled Neymar's GA output in Brazil. You could argue that the Brasileiro was tougher and had more quality back then though.
Watched his highlights and I'm impressed with his progression, but two points.
He lacks athletic spark which may harm him in Europe, technical prowess is undeniable though. The second is that he looks like he is doing everything through treacle. The feet are fast but the body is slow. Think early Trincao on a bad day.
Lastly, Chelsea is 100% the wrong development move. He will likely end up in Strasbourg next season though.