Minato did touch the Kyuubi, that's why he had to have Gamabunta hold him down. And Minato had to stand still and open a warp to teleport the Kyuubi Blast. since Minato can't touch Amaterasu and he won't know it's coming, he can't warp it. And Minato wouldn't be able to teleport Amaterasu to Itachi.
Minato can only teleport something to wherever one of his tags are.
How can Kirabi's interception be based on reflexes? There was nothing for Kirabi to react too. He was a good distances away, to far for it to be an reaction. Sasuke was able to see Ee, even though he was using his max Lightning Cloak along with shunshin. Not only did Sasuke find him, but Sasuke was able to react in that instant to activate his Amaterasu shielding over Susanoo. Itachi has shown the reflexes by the fact that his reflexes were better then Sasuke's. We were specifically told that Minato's reflexes were comparable to base Ee's reflexes, while the Sharingan has been shown greater then Ee using his Lightning Cloak.
First off, Susanoo isn't invisible. It couldn't be invisible to Sasuke, as he would be able to see the chakra itself. Also, the translations make it clear that Ee and gang did see Susanoo
[1][2]. Not to mention that we as the audience are always shown it, so we know that Itachi didn't have Susanoo activated until the last moment.
Tsukuyomi has never killed because Itachi didn't want them dead. But here, Itachi can use Tsukuyomi without holding back. Itachi going easy landed both Sasuke and Kakashi in comas. So even he doesn't outright kill Minato with it, Minato will be as good as dead anyway. Ee was speaking of Minato's speed from Hiraishin, which was the only reason Minato was able to outspeed him. Hiraishin can be gotten around as we have seen. What do you mean their destructive power isn't a match for the Rasengan? The normal Rasengan has never done alot of damage. The Rasengan can't even tear through a person's skin. Not to mention that do do the most damage, the rasengan has to be held in place. There's no way it'll get through Susanoo, especially Itachi's Susanoo. Ee only had to deal with the riblets themselves and Danzo dealt with the unarmored version. Not only does Itachi's Susanoo have armor, but it has the Yata Mirror which counter all ninjutsu. So not only would it be futile, but Minato would simply be opening himself up to an attack from Itachi. And Itachi would know about any tags, as he would see the chakra in them.