What's with these villainous types thinking they can single-handedly take on someone everyone calls, "god"? If he's 'come back from the dead', it better be more than just your family you call up.
Like, wasn't all of the martial arts masters that originally went after him, couldn't stop him, and had to hope for an old monk's sacrifice to take him out? And now, unbenounced to anyone but the reader, he is now stronger than you could ever imagine. What Obi Wan really wanted to happen.