The best thing is to use logic and observations.
I've rewatched the Wild Card games, and saying they will get out of group stages is crazy. It would be a miracle if one of them gets to third place. Maybe BKT, but that's a far fetched.
Moving things randomly is a bit dull. The one positive thing that might happen, is that you get something improbable right, like C9 going second in their group, or EDG getting third.
Putting favorite teams on top is even worse. Moving things randomly at least has the chance of having pure luck and guessing them all right. You know, PAIN Gaming finishing first in Group A is impossible.
If you wanna do moderately well, check out Jatt's predictions in the Boards and the Predictions in the articles section on the worlds official site. I must say the official predictions for group B look dull, though. Keep in mind that each of the predictions is made by different guy, so take it cautiously.
Also check out the Celebrities section in the leader boards - those guys are either Pro Players, or Coaches and Analysts.
Checking all of that would help you build something plausible :)