Re: The raikage will gut itachi.
Raikage looks into Itachi´s eyes: Getting caught by Genjutsu (just Genjutsu, not even Tsukuyomi), plenty of ways to kill him after that.
Raikage doesnt look into Itachi´s eyes: Getting caught in the flames of Amaterasu. As we saw in the Kage Summit Raikage needs to be in V2 and fully concentrate on the caster to be able to see that Amaterasu is about to be activated.
Raikage looking at his hands: Genjutsu again.
Raikage (somehow) landing a hit: Crow or explosive clones.
However he wouldnt even be able to break the complete Susano´o..add the Yata Mirror to that and he would probably break his own hand xD
Raikage wouldnt even have time to attack because he would be busy, trying to avoid the very fast Totsuka Blade at all times.
Last but not least Itachi could resort to Izanagi and/or Izanami if everything fails but Raikage couldnt push him that far.
Raikage is fodder compared to Itachi, just as pretty much everyone else.