I believe that Revan pretty much wreaked havoc in Dromund Kaas then died in battle, probably only causing the True Sith a speck of trouble. He didn't live after going away. Everyone hates to see thir favorite character die, which is why there all these theories on him being alive, but the truth is that Revan died. End of story.
"There is no such thing as coincidence, only inevitability" - xxxHoLiC
"Justice? But I don't serve justice, Watson, I serve the truth." - Sherlock Holmes