I get it,am not trying to bust your ballsxd but so does the tittle Hokage also apply to Minato..A Hokage must at least have 2 Release,I mean Kakashi said that Jonins have 2 Releases
Minato has only been shown how many times,It's like saying that if u remove Raikages lightning armor Then he will lose because of that
Kishina Minato's wife has already said that Minato was taught a lot of Justus
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AND I QUOTE i taught minato a Lot of Seals,so To say that Itachi has an ability which he has not shown is being unfair,I am looking at things from both side
Minato has 100% chance of getting SAGE mode but he hasn't shown it so he doesn't have it,try & understand the same goes for Itachi..If someone has water release don't mean that the person can perform all the styles to it U_U