Well, Revan's fall is a culmination of the several things. The Mandalorian Wars started it, Malachor kicked him to the edge of the proverbial cliff, and Vitiate drove him over the edge.
You can if you want to.
Well I started writting up the thread and then my computer had a freak-out and I lost all my progress. Screw it. I'll do it some other time maybe.