i think this topic is being thought into a little to much lol.
I dont think he ever died, e.g when vader slapt him around and at the end of the game.
Reason why ..... i find it hard to belive they would already kill off the main charcter in the middel of the game.....
Also , based on things that ive heard about the cloning idea, its all very inconclusive , there is something else behined the curtain. We still dont know for sure that he is a clone which means he oviously didnt die at the end of TFU , only time will tell guys.