A couple of posters have figured it out already, but here it is, one more time...
The TFU2 DLC Endor addition IS NOT, I repeat, IS NOT a continuation of the TFU DLC.
TFU2 DLC Endor addition is a continuation of the "What-If" Non-Canon "Chose the Dark Side Ending" to TFU2 where the evil Starkiller clone kills you and then goes on to continue the mission Vader was hoping to have you do.
For the TFU DLC additions you play Darth Starkiller from the "Dark Side" ending of the original game. You're the new "Vader", all messed up and requiring a breathing aparatus after Palpatine owned you by throwing the Rogue Shadow at you and you confron Luke where you DO NOT kil him, but convert him to the DArk Side and take him on as your apprentice.....and that's it. There has been no continuation of the Darth Starkiller from Lucas Arts as of yet.
In TFU2 DLC Endor addition you play a character you have NEVER played before in any TFU game....you're NOT playing Galen Marek from TFU.....you're NOT Darth Starkiller from TFU DLC....and you are NOT playing the "clone" Starkiller from TFU2. You are the evil Starkiller clone from the "Dark Side Ending" of TFU2 and you pick up his story on Endor sometime after he has confronted AND killed Luke in a never shown or never played by you confrontation.
I hope this clears some of the confusion up.
Although, shame on LucasArts for making something so confusing anyway.....LOL!
And, all being considered, man it sucked and was painful to actually see Leia, Han and Chewie (especially by Han's blaster fire!!!) die. Total let-down.
Come on Lucas Arts, give the fans what they REALLY want.....a truly epic SW game where we get to play as Luke, Han, Chewie, et.al!!!!