I KNOW RIGHT? I got überworried when they said that Max was a street kid and Gus had paid for his education and shaped him into a brilliant chemist, and then BOOM. Of course, Walt managed to become as evil as Gus if not more so with slightly less justification already, so parallels are unnecessary.

I think the two options that leave Jesse standing at the end are a) he replaces Walt after Walt replaces Gus (dark) and b) Walt dies in such a way that makes it possible for Jesse to escape (happy!).