@bold. all the feats HEbi Sasuke performed were without his CM activated. Not once was his CM activated during part 2 when opponents noted his godlike speed.
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One thing you also overlooked is that MS increased his powerful chakra thus making his speed even greater. I'm pretty sure I shouldn't have to tell you there is a correlation between chakra and speed after the war arc. Sasuke can't keep up with MAdara? lol, Madara was reacting to his moves but that doesn't mean he couldn't keep up. SM Naruto couldn't keep up, he was blitzed, Madara praised Sasuke for his moves.
Juubito flying around at top speed is a feat and then Sasuke reacting to it is a feat or else you must be daft. Just because you know something is coming doesn't mean your body can react to it. Lee taught us this since part 1. He also protected Naruto from Juubitos strike while the kages had a hard time keeping up with him. IF you want scans for anything I mentioned I will be happy to post them later I'm about to head to work.
The curse mark empowers you regardless of whether you are or not using it, we even see in part one after sasuke came out of pot, he was stronger now that final stage of his curse mark process is done. It even says scan you post. "Curse mark empower him with strength". He not only one describe to have "god like speed"
Amount of chakra does not mean you just get faster. Has to do with chakra control and skill and technique and other things. Kisame is not fast yet he have more chakra than most. No where did we see sasuke getting faster as his sharingan evolve. He have better feats in hebi.
You also say sasuke keep up with kcm naruto. Which is exaggeration by you. Naruto in km never was at top speed when fighting with sasuke. What you mean sasuke reacting to his moves? Madara didnt attack him, sasuke attack him. Madara reacting to his moves, yet couldnt catch him. Sm naruto was not blitz, blitz mean you do not react, naruto reacted. He blocked madsra, but madara strength sent naruto flying, that not naruto fault, if they were equal in strength, then naruto would have blcoked with out getting sent flying. That is not a blitz.
Sasuke was tracking, not reacting, his eyes have always be able to track fast things. Juubito stopped flying and grab both naruto and sauke. Never was sasuke actually keeping up and chasing juubito. Sasuke was just about following. You are using sasuke feat of saving naruto as valid speed feat, which is wrong. That was a ling range attack from juubito, not direct shunshin attack from juubito. Sasuke had plenty tine to react to an attack like that. Sasuke get blitzed here even with ems
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. Just like the kage did, and he fails to react to juubitos movement. Only reason he keeps up later is because sasuke get more opportunity and time to get used to his speed. It same as minato vs raikage, first time raikage speed surprise him, second time minato is clam and easily react. That does not kean minato got faster, it just mean he got used to it.
I feel you sasuke fan try to make bog deal out of anything without actually trying to just think of it logically. Im not saying he not fast, but tracking juubito movements when he could not before does not mean anything.