He reminds me of Kovacic. Not in terms of playing style, but in term of potential vs. ability. You can see glimpses of pure class, and than bad positioning, missed passes..amateurish fuck ups. I think the problem is, he is trying too much to prove himself, and that could be his biggest problem. I think he trying too much to prove the money spent on him. However, i think now that we made record signing with Joao Mario, and most hyped player in Gabigol, the attention will be on them, so Kdog can work on his game, and develop without pressure.
What i think FDB should do now, is to FIX him position, and teach him what to do in that position . I think Kdog is not like Sneijder or Banega to have a freedom on the pitch, and to dictate the game. For me he should be teach how to play B2B. Help in defence, regain possession, move the ball forward (long legs, fast, good dribling), and pass to Banega or Joao, so they can create the attack. He can participate at attack, but only as a "bridge", meaning gets the ball and deliver to other player with one touch (i think he is very good at it), and sometimes if he have opportunity to shoot on goal.
Anyway, i think that with proper tutoring, he can become one of the best B2B in the game.