Board Thread:Versus Debates/@comment-44829986-20200426232150/@comment-4080775-20200524013946

Super Multi-Size Technique can allow him to deal with Susanoo by allowing him to grow larger than Itachi's Susanoo is, as well as scale the force of his taijutsu and the scale of his techniques. Shadow Imitation Technique when used on this scale would allow him to stop Itachi and his Susanoo's movements. The Uchiha Return honestly could be used to turn Amaterasu into wind chakra to disperse the flames and blow back any that make be incoming. Hiruzen could really get creative with his arsenal if his title is anything to go by.

If Hiruzen can stay away from Itachi's Genjutsu, he could literally mix and match techniques and counter a lot of Itachi's arsenal with no problems. If he has large chakra reserves, that makes it even more evident, but of course ITachi fans will just straight to Tsukiyomi, Yata Mirror or the Totsuka Sword, so I'm not even sure if this match up is worth arguing.

You can't win an argument with stubborn people (hardcore fanboys).