I am sorry but why is Steb not in this list?
In Spvp, (where in only matters), Steb has one of the best combat awareness in the game. His understanding of the class far surpass anyone on this list. At the very high end of this game, there is 1 thing that only matters, and that is team play. Dueling means nothing, however your reaction to situations is what matters when you play thief.
When you see Steb on the battle field he is not just there, you will feel the pain within seconds. His targeting, position is spot on for a thief. Honestly you can not even judge who the best thief right now, even when ladder comes out, it means nothing. Again mechanical and technical knowledge of the game makes you a great player. Not how high your MMR is. Ether way Steb is not just one of the greatest thief’s he is one of the best players of the game right now.