It was my understanding that when you destroy malachor for the second time it was to help in the healing of the wound in the force created by the shadow sheild device. chodo says that by healing the life on telos you restore connection to the force, so in <if youre playing ls here> helping those planets youve healed your own wound. i think nithulus was created as a direct result of the exile severring his/herself from the force, and that he is a "negative" of the exile himself. So, that being said while nithulus would feed off the force and slowly kill those around him, the exile has the oppisite effect, spurring rapid growth in those around him/her. by facing his/her past the exile CHOOSES to allow the force to return to him. kreia SAYS you are a nithulus, but we all know how she loved to manipulate you so youd prove she was right.
allthough...
kreia also said that you were supposed to train and send others to aid revan against the "true" sith, so i think it would make sense to bring them with you. hah you could all make each other stronger and maybe along the way atton can teach you some more about using lust to sheild your thoulghts...no i mean......PAZAAK *wink for the women*