Yeah actually, no one thinks of it, but thats insanely big step (I know people who play in superettan, they dont stand out much above the rest of when playing for fun, except their fitness), and should require intense period of adapting. He wasnt even a super performing player for his low level club (or the U-19 NT), even if showed his talents and was one of the better ones.
Needs alot of developing, and its quite more then promising enough he has shown he fits in well enough so far.