You guys are making the same mistake you make with Chakra Mode Naruto. You assume he's always capable of using his max speed in any given situation. It's just not possible. Shunshin is not a "mode", it's a technique. You use it, your movement is boosted, then you return to your base speed. This is how Sasuke countered his attack with an Amaterasu coating his Susanoo ribs. Secondly, you neglect to mention that EVEN with Raikage's V2 speed AND seeing Sasuke cook an Amaterasu he STILL wasn't fast enough to hit him before he could mount an Enton defense. This happened in the manga, but you're so sure it'll work this time?
Originally Posted by Uchiha_Blood
It consumes it. It's just that you can feel the true depths of his chakra reserve when he's actually tapping into it. Normally a sensor can sense a chakra reserve of a person, but not in it's entirety unless they're actually tapping deep into it. Think about every time Karin sensed Naruto's chakra. She would've frightened the same way if she sensed him using Chakra Mode or some other large amount of chakra. But sensing him in base mode wasn't as frightening.
On a side note, does Raiton Armour actually increase A's chakra instead of consuming it?
Karin remarked how A's chakra reached Bijuu level when he activated the armour
You're over-simplifying. First off, the reason one hit and the other missed is because Sasuke dodged while Raikage was commited to an attack. He beat Raikage's elbow with timing and precision. There was no mistake, no element of chance. He simply overcame it. Secondly, this was without the aid of Susanoo, which further destroys the notion that Sasuke needs Susanoo active throughout the entire fight.
Because the difference in that would be that Sasuke's hand had already Chidori, he didn't summon Chidori mid-swing.
Both stuck at each other, one hit, the other missed.
He can't dodge if he's in mid-air from leaping over an attack Sasuke's thrown to set him up, or if he's dodged an attack to come to Sasuke's blindside. Or, if Sasuke baits him into a counter attack by running at him like he did with the Chidori. Raikage, even with prior experience fighting Susanoo, has still proven he has to rely on close range attacks to do any damage at all. And let's not forget, Sasuke can predict where he's dodgeing to, not just where he's going to attack. Forcing Raikage to jump where a Kagutsuchi was planted prior will make Raikage take himself out.
In a similar situation ( which will not occur, probably, since Sasuke can't follow V2 and Raikage with info wouldn't risk such an obvious mistake ) Sasuke would need to summon Susano'o first, and that split second would be all that Raikage needs to dodge.
Shisui's eye was active. He just couldn't use MS with it. It's how he managed to escape Genjutsu (remember, when he escapes Sasuke's Itachi illusion, you see all the eyes in his arm darting around as if they were seeing through the Genjutsu.) So even if you managed to prove Shisui's eye wasn't active (which you can't), all his arm Sharingan were. Not to mention this was the first time he'd reached this Susanoo version, and Danzou was standing still rather than Shunshin'ing toward Sasuke to perform a Lariat or Elbow. If he was propelled toward Sasuke like a rocket there would've been no dodging.
When Sasuke was paralyzed by the seal, he noticed Susano'o and made a last second dodge, which left him with a barely wounded arm.
Wanna compare a one-eyed 80+ years old ( Shisui's Sharingan wasn't active at the time ) to a guy with insane reflexes and speed?
Slows down the user. As in , it's hard to move around when you've got an armored spirit seeping from your pores. But if you're already being moved by say... using Shunshin before activating it, or in a free fall, or jumping tree-to-tree. Multi-tasking ftw.
Also, as Itachi or Kabuto said, Susano'o actually slows down the user, so it wouldn't be advisable to use it in close range