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I honestly think that the Mind Drinkers are aliens. The Sith are a different thing. Oh, and I think that something major is gonna happen with Ben and the disease definately. I also believe that we'll have an issue with Han and Leia and the whole Jag/Jaina thing but my real issue would be with a death. With Denning in the mix I feel like a jerk but I'm guessing at which cadaver will become part of his collection. Personally though I have to say that Golden jumped straight in and did well. Now onto my series as a whole statement...
I believe that this series is overall meant to explain the random turn of Jacen and the plot points in the series. There were somethings that were stated but not completely shown. And Jacen's turn was in Betrayal, he just had an urge up until that point.
Perfection is a lifelong pursuit requiring sacrifice. The only way to get it quicker is to sacrifice the most.