Itachi's tsukuyomi is instant my friend. What makes you think he will be able to get a kunai inside of susanoo? How will he teleport away when he hasn't set a kunai down far away?if you read my op you would see very clearly i don't say 'minato can beat every character in the naruto universe' i just think he can beat most of the mega powerful characters. he has bad match ups and can lose.
gen: user is dead before they can use it. ama: minato ftgv2 during charge-up and kills. sus: teleports inside with a kunai and kills. if yata is in effect there is a few extra teleports to get an opening. if ps or that other sus that isn't open is being used and the user isn't edo he simply teleports away and comes back later after they drain their chakra. if they are edo + ps he is screwed. shinra he teleports away/close to avoid pull/push.