Good questions man..

To me its all about what makes a dj great is certain qualities such as:

1. Skill
2. Energy, attitude towards fans
3. Able to work the room, change gears during a show
4. Dj's personal style.. whats hot with EDM fans at the time whether its prog trance or house
4. Does he produce, remix, and how good are they at that?
5. What does he bring to the EDM world?

Those polls are based on people voting on their favorite djs according to their taste, some may like Hard House some Prog trance. Go to a Tiesto show and tell me it wasnt insane! He draws upwards of 100,000 people in Argentina, Ibiza, Spain, etc..

You like the turntablist side of electonic music which is great as well and Q-bert, Craze, all those guys have mad skills but the following isnt as large and thats why they are not on that list.

Edit: Check out what Sasha is doing these days, he is not using turntables or cd decks. He is revolutionizing the DJ world by using a Mac/Apleton Live software/Controllers and playing a true DJ set where he can remix /redit sounds, loops, etc on the fly and create anything at any moment in his set. No set records or tunes just straight up creativity on the fly, its insane.