Solo King's Susanoo is a good moment

Orochimaru is already a proven coward; he openly stated that he surrendered to Itachi, and we've seen him justify his fear by saying that Sasuke is a better vessel.

This is part of the dialectic between surrendering and resign present in the series, and Itachi's Susanoo is a clear example of surrendering, since Orochimaru's desires were always focused on Itachi.