Sylvia's an interesting one.
I wonder just how much improvement is in him. So far he's mainly played a cameo role in most games, ie- a freakish mark here, a good goal there. And he has certainly been injury plagued so its been hard to get full games out of him.
On the other hand he started 2006 in full fitness and played the first 7 or 8 (NAB included) games and while he played well, he certainly wasn't A-Grade level.
So the question is have we seen the very best of him when not injured, or is he ready to explode and become a consistent A-Grade performer!