Why Would Itachi Use Amaterasu?
If I’m not mistaken, Amaterasu blasted through a fire breathing frog; something the great Sannin, Jiraiya, found incredible. I know Sasuke is on top of the world at the moment, but I doubt he can take a head-on blast from Amaterasu and not turn to ash… I don’t even see how Amaterasu is an option considering it wouldn’t just kill Sasuke, it’d evaporate him.