TSL must keep some coherence with the star wars universe. If all the jedi are wiped out (if your character chooses to embrace the dark side), then EPs 1,2,3,4,5,6 can't logicaly exist (obi wan and all jedi would'nt be jedi because no jedi would have taught them to become jedi)
And again, what about Nar Shadda. Is it really in Kotor2?