Can someone please explain The Force Unleashed 2 ending DLC?

[crazyrabbits]

As I gathered it, the Endor DLC from TFU2 continues the story of the "What if" Dark side DLC from TFU1.

How can it, when the Starkiller from that was stuck inside his suit and Darth Vader was dead :|

Because the TFU1 DLC follows a non-canon storyline where Galen (now under the Emperor's tutelage) visits two locales from the trilogy in a "What If" storyline (killing Obi-Wan on Tatooine and bringing Luke to the Dark Side on Hoth). The canon ending (according to Lucasfilm, anyway) is the TFU1 Light Side ending.

I guessed when the Endor DLC came out that it was originally intended for TFU1 - it was dirt-cheap, and seemed to be tied into that ongoing "What If" Dark Side storyline.