Luffy was unable to do the same with Kenbunshoku Haki despite inferior users like Satori being able to see how Luffy's abilities worked before he used them. Fish-Man Karate is very complicated fighting style and Jinbe's personal skill is so great that even 100th degree black belt masters can't begin to replicate or compare to him, so I doubt that Sarada would just "figure it out" as quickly as you're making it seem.
The Sharingan is called the Eye of Insight because it's able to see things like
chakra and
invisible beings. It also allows her to "
see the reality behind any illusion or spell ...
allowing them to instantly acquire and decipher information in a blink of an eye." So yes, it will be that easy for the Sharingan to do. Sasuke was able to figure out how Deidara's Jutsu worked thanks to his Sharingan and Sarada was able to easily decipher both Kako and Boro's abilities and weaknesses with just a glance of them using their abilities. I cannot speak for why Luffy was unable to but that's not a counter to the Sharingan's visual prowess, nor is it a resistance for Fishman Karate users so it's either an inconsistency or a weakness for Haki or something else entirely.
The Sharingan also allows them to instantly copy the technique, so replicating it is a non-issue although that's not what I'm arguing here.
Jinbe is able to keep up with and out-box people like Who's Who, who is a genius in martial arts relative to Rob Lucci. While Sarada is skilled, Lucci who became the greatest CP9 agent at age 13 and by the Pre-Timeskip is capable of skill stomping and leading
the best roster of Rokushiki masters who train in martial arts their entire lives from very early childhood.
I mean if we want to talk about skill, she's comparable to Boruto and Mitsuki, with the former stated to be of Jonin level skills during the Chunin Exams. These kids by this point easily defeat Jonin level characters and Sasuke himself stating that Sarada is far above his level at the same age, and he was far above Jonin as well. Sasuke's stated by characters like Lee, Kakashi and even acknowledged by
everyone in the village to be a genius. Sarada on her own has fought War Jonin like Ao and received accolades from Sakura, and Sasuke themselves, with Sakura even comparing their training to what she went through with Tsunade one of the Legendary Sannin. Not to mention that Sarada was acknowledged by everyone in the 2nd Chunin Exams which allowed her to be promoted to a Chunin, which allows her to lead her team without Konohamaru, who's stated to be the strongest and best Jonin currently within the village by a looong mile. Sarada is definitely no slouch when it comes to skill and I don't think she will struggle against Jinbe here in skill.
I do agree that her Sharingan can fill the gaps but it's not as if Jinbe doesn't have Kenbunshoku Haki and is experienced if fighting opponents with sensory abilities while Sarada at this point isn't as much.
Sarada actually is. She's fought and trained with Sasuke, and fought Shin, two characters who have Sharingan (far superior to her at both points), she's also fought characters way faster than her like Deepa and Moegi, and with the former literally allowing evolving her Sharingan mid fight.
True on the former. I was just saying that she can use a Clone to take a blow while she creates space.
As for the latter, what application/P&A of Observation Haki allows him to do that?
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