Itachi can tank all of Minato attacks with Susanoo. And you underrate Itachi's speed. He isn't as fast as Minato, but he is fast enough to cast a genjutsu on Minato. Kakashi and Sasuke couldn't keep up with his hand seals, and both were seeing Itachi's movements in slow motion. Itachi could also use dusk crow genjutsu to fool Minato. You guys speak as if Itachi's genjutsu lasts a long time to be casted, even if the manga has proved otherwise. Itachi's genjutsu is instant as well.Take Your Choice:
1)Shunshin Blitz As Sharingan Can't Track His Movement.
2)FTG Blitz By Simply Tossing a kunai As He was Able To Place a Kunai Under JJ Madara Before Kakashi Can Execute Kamui Snipe (Dat Hand Speed!)
The Point You Ignore Is Minato Is Tiers Above Itachi In Reflexes/Reaction Time,Striking Speed & Body Movement...Itachi Is Like a Sitting Duck In Front of Him...He Can't Even React Or Realize How He's Gonna Die.