So we just gonna act like izanami doesn’t wreck danzo?
Regardless, it’s extremely apparent Danzo recognizes itachi as far stronger than sasuke in that fight. Also, danzo has no answer for several techniques, even just regular taijutsu from itachi, who was shown to outpace km naruto.
Also genjutsu-> totsuka blade. It’s possibke totsukas sealing effect will negate izanagi. And if it doesn’t, izanami ends the fight right then and there.
Another cool fact; itachi using ms techniques outlasted sasuke in chakra. This means despite popular belief (and misconception) itachi has superior chakra reserves. Which means if sasuke could outlast Danzo, so could itachi. Not that he’d need to.