The thing with Onimi is, his entire nature, skillset, power, vongese wtf-factor and his mentality result in "anything is possible" route. Whatever's the battle ground, whatever the first thoughts and movements of the characters will be, the different outcome will happen. He is so beyond any other villain in the EU, he can be legit taken down by some Atton Rand/Shado Vao punk, he can take out Yoda. He's as much a wildcard as you can get in SW.