Itachi saw the lightning coming and had the ability to prepare for a decent amount of time. Madara wont have this opportunity if he gets surprise-attacked.
Tobi absorbed Fu
as he got out. And Madara wont even see it coming (Tobi wont say "you're" next) so he'll be gone. Naruto coming in with a Rasengan
(with Madara seeing the attack coming) is a lot easier to dodge being near-instantly warped by Tobi,
who Madara won't see coming.
Minato was warned of his presence first, something Madara wont be. And FTG is more instant than Susanoo activating, which can again be dodged by Tobi doing what he did with Fu.
Maybe activating MS doesn't take too long,
but realizing the situation does. Look at Fu. He was gone before he knew what happened. Same with Torune. Minato was near gone before he was able to FTG, and this is after Tobi waited a little before beginning to warp him. I don't think you understand the part of Madara being
surprised. In all scenarios you've posted, the people have seen the attack coming, and still barely protected themselves.
In both of these, the MS users saw the attacks coming. If the same thing happens as with what happened with Torune, they're toast. Tobi warped into Jinton, grabbed Sasuke, and warped out, and Sasuke had almost no time to even react during that. If Madara doesn't even see the attack coming, what makes you think he can instantly use Susanoo's ribs in the exact area Tobi is in? What if Tobi does what he did with Torune?
Susanoo isn't instant if the user doesn't even know to use Susanoo. :sy: Not one person has seen Tobi's warp coming and form a counter other than Minato, who was alerted of his presence and has an instantaneous S/T tech.
Torune and Fu figured out his S/T techs and still got warped instantly. And Madara wont have anything to figure out if he's warped on the first go (which no one but alerted, FTG Minato has dodged).

Minato's reflexes and FTG speed > Madara's reflexes and Susanoo's activation speed.
And even if he figures out the S/T techs, in your near-impossible scenario, you're telling me he'll be able to predict will Tobi will warp and hit him with Amaterasu which takes time for the person's eyes to bleed, eyes to focus, and such?