Why are you trying to invent an action going on in the panels that isn't shown or hinted at? Kakashi was never shown building up chakra with Kamui like
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does.
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is the panel where he initiated Kamui as there is zero indication that he started in the panel you claim he started at. Zero indication whatsoever.
Who ever said extracting it was instant? That part has no relevance here as Kakashi used Kamui on it AFTER it had been extracted and got it despite it being able to teleport. So no, this time frame you claim he needs was never needed in the manga.
@bold: Never said you didn't, but its practically nonexistent due to its speed. So Tobirama isn't capitalizing on it, especially with no intel.
The fact that Kakashi missed its head and got its arm instead only shows that Tobirama is going to lose a limb even if he manages to teleport away. The Mazo's size has no relevance to your argument as Kakashi isn't going to make a barrier the size of the Mazo to suck Tobirama in, so he's still going to lose a limb.
The bold is nothing but conjecture. There is literally little to no evidence that lets you even begin to say Kamui started being prepped on that panel.
And as said above, that doesn't matter since a Mazo sized Kamui barrier isn't going to be used against Tobirama, as that is the only way this comparison would work.
Seeing Enton means he'll be ready for a S/T Ninjutsu technique that originates from the eye? lol, don't even try it. He has no intel on it thus he has no clue what Kakashi is going to do, since when were all MS techs one shots in his time? The only one you can possibly think of is Amaterasu, and that's if Tobirama really referred to Enton when he said Kagutsuchi, considering that means Flame Control.
Kamui's prep is so quick for smaller targets that its practically nonexistent, so Tobirama would die before he even gets his Kunai out and tosses it.
If he teleports, he still loses a limb since the barrier size isn't going to be the same size as it was for the Mazo, it'll be a Tobirama sized barrier.