Tsukuyomi is an MS based genjutsu that a sharingan, which can see through jutsu, stands no chance against without bloodline. This is proved when itachi catches kakashi with it. Even without that, susanoo and amaterasu need to be dealt with. Overall itachi obliterates tsunade so the theory of kage always being the strongest is incorrect. As for itachi vs Sasuke that has been brought up a couple of times, itachi is defeated by choice, not strength. Orochimaru killed hiruzen. This is all fact, not really opinion. As for king Hashirama, you keep pointing out the use of a story point of view. The story shows us strengths and weaknesses. With no story point of view, we have no evidence to support either case. So we need it.