VdB's had his settling-in period, hopefully he kicks on this season. Looking back at his PEC Zwolle highlights, I'd say that he's yet to show those attributes at LFC, the English game is tougher and more intense, so it's understandable.
Once he's adapted we'll see more confident displays and his reading of the game should blossom. We'll see what Sepp is made of this season, I believe.
Koumetio and players blessed with his physique, athleticism and flair will often jump the queue as they've already got a part of the game youngsters struggle with.
Personally, alongside these two, I'm really interested in seeing Rhys Williams' development. He's impressed me almost every time I've seen him.