Revan speculation
I was bored and came up with this idea where Revan is the physical embodiment of the will of the Force. Total speculation, 99.9% chance it's all bogus, but it's just an idea to think about.
Now what made me think that? Well he is extremely powerful, Kreia says he is like the heart of the Force, he has an insanely strong will, and he saved the galaxy (or Republic) 3 times. First from the Mandalorians, then from Malak, then from the original Sith Empire, and Kreia thinks he did it all to save the Republic and everything had its reason. And perhaps in KOTOR 3 he saves the Force by killing the Exile or something.
Now, if he represents the will of the Force, why did Malak almost kill him? Because Revan wasn't strong enough to face the original Sith empire yet. He got far stronger after KOTOR than he was during his first reign as Dark Lord of the Sith, until he was powerful enough to defeat the original Sith empire. It seems like everything had a purpose to me.
Once again though, this is just an idea to throw around, there's no proof of anything.... yet.