There is one way I see Kaan winning this:
Bane betrays Kaan and joins Revan, probably killing Malak. The Brotherhood, or at least Kaan, flee into deep space. They hide for however long it takes for Bane to become stronger than Revan and kill him. Bane then uses Revan's fleet to find and destroy the brotherhood, but it doesn't matter, because Revan is dead and therefor Kaan wins.