Why is killing Juhani a disadvantage? You get two red lightsabers early on in the game and you don't have to bother killing her later on at the temple mount. Plus Canderous, Zaalbar, and HK-47 are much better in a fight than Juhani. Seems to me killing a party member early on is an advantage. Just look at it as cuting dead weight.
Dark Wanderer the answer to your first question is yes. As to your second question whom it would be the answer is the first one to get in my way.
Cheers!