Really? I'd say the Yata mirror is a pretty s*it way to defend yourself considering it only protects the SUsanoo from one side. If someone hits Itachi from the back, he's a goner. Plus, Totsuka will always be limited by range. You can't seal what you can't reach. Both of those are widely overestimated in their capabilities. Rightfully so at the time, but that was when Orochimaru was a big deal and summoning meteors from space wasn't a thing. Stakes have changed, which only goes alongside my point, which is, to answer your question, that Indra Ootsusuki would completely crush Itachi in battle and deserves a spot on this list far more than he does.