If you kill Yura-ban (sp?) and Uthar then yes you have to fight everyone. But.. there is a way to kill only Uthar, and then you can re-enter the academy. When you have to pick sides, say you're with Yura, then kill Master Uthar. Then Yura will turn on you. I said "I don't want power" Because I knew I had to try to not kill her, so I could give the datapad to dustil. I broke in before to Uthar's room, but I guess I missed that footlocker somehow. So anyways... I had to fight her anyways, but she says, "Wait, I surrender, you are too strong." Or something along those lines. She then says, "Gather your hatred and strike me down." Or some such junk. I said, "Leave now. Go!" and then, she claims you aren't a true sith. I responded with, "I'm showing you Mercy, don't push it." She talks about your destiny yadda yadda, but then says she'll let you leave and won't try to stop you. So then I go back to the Academy and tell Dustil about Uthar.
So yeah, if you have your fight saved against Uthar, then just do that

I chose to fight him because after I killed them both, he had 3000 credits and a couple other goodies to sell/use on my droid. So I wanted his stash.
Hope this helps =)
-Sven