1.Wrong. Enton is Amaterasu being manipulated into another form. They have different properties and are better at different things. Amaterasu has already shown to be faster so there is no debating this point.
2.Wrong again.
Amaterasu spawns where the user is looking. Enton
travels to the target Enton is slower. When Sasori is as fast as A or is a sensor then we can talk about him reacting to Amaterasu.
3. If you really think someone of Itachi's intelligence would underestimate Sasori like that then you have been reading the wrong manga. Not to mention Susanoo can be activated in less then a second. He isn't taking anyone by surprise.
Stepping near it isn't going to work and he isn't going to step on it either.
No he isn't flying faster than Totsuka can extend. He doesn't even need to pierce him. Its a sword, all he needs to do is cut him with it with wont seal him but it will destroy the body he is currently in.
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Low stamina=/= Dying when using his tech for a few minutes.
2. A broke through the bones and hit Sasuke.
Gaara had to use the sand
already at Madara's feet to make contact with him. He can't slip it under Susanoo and make contact with Itachi, what is so hard to understand about this simple concept.
Also Susanoo can be activated in 1/1000th of a second. It doesn't matter if he doesn't start in Susanoo because he can simply call it when he needs it.