We know that Isshiki's arrival is with Kaguya as told by
Amado in chapter 46. However,
there was an incident that made Kaguya betray and hurt Isshiki to death.
In order to survive, Isshiki shrank his body and became a parasite until it could affect Jigen's entire body before attaching karma to him.
We know that Kaguya herself has comparable speed to the Konoha Duo, as
Kaguya showed the capability to react and dodge Sasuke's attacks. Or
have a solid fight with Naruto,There are even cases where Naruto can out-speed Kaguya who is off-guard.
For someone to catch off-guard and hurt another person, it is certain that the person's capabilities are at least of the same level. Because if we use the example of a battle where a 10× higher speed is tricked by a 10× slower one, it will create a contradiction that will actually refute the existing narrative and chronology. Although Kaguya is relative to the Konoha Duo, Kaguya can catch Sasuke's off-guard and then throw him into another dimension, as well as Naruto who can sever Kaguya's hand with his speed. This already shows the chronological consistency that the Off-Guard case can be injured or captured if it is relative (level). The premise is chronologically the strength and speed of Isshiki relative to Kaguya, and Kaguya relative to Naruto and Sasuke. Since Kaguya is described as being able to injure Isshiki off-guard, then Kaguya should also have the speed to react to Isshiki.
If Isshiki is 10× faster in her first mode on Earth because she hasn't been hurt yet, does it make sense for Kaguya who is 10× slower to hurt her despite being off-guard? If the difference is 1.5× or at best 2×, it might be possible, but if it's 3×, it can have a significant difference (for example, a motorcycle whose speed can be 3× human speed, it can blitz us and catch us off-guard at full speed), let alone this massive 10× difference. Especially Kaguya here after being reincarnated with Madara's body can be comparable to the Konoha Duo.
It goes like this; when an individual has a speed that is 10× higher than their opponent, the speed difference creates a massive gap between the two. In the context of combat, this means that the faster individual has a huge advantage in reacting and taking action, making it difficult for their slower opponent to hurt them off-guard. For example, imagine a situation where a cyclist who has three times the speed of a human walking. Under those conditions, the cyclist would easily pass a person on foot and injure them off-guard before the victim could react. The significant difference in speed creates a time gap that slower opponents cannot overcome, making it difficult for them to carry out effective attacks.
Similarly, in the context of a fight between two individuals with a huge difference in speed, such as 10×, the faster individual will have a huge advantage in protecting themselves from attacks or injuring the opponent off-guard. For example, imagine a martial arts expert who has ten times the speed of his opponent. In that situation, the martial artist would be able to evade his opponent's attack with great ease, even when the opponent tries to attack suddenly. Much higher speed provides faster reaction time, greater agility, and the ability to better anticipate an opponent's attack.
Thus, it can be concluded that a significant difference in speed, such as 10×, creates a gap that is almost impossible for a slower opponent to surpass. Individuals who have higher speed will have a dominant advantage in off-guard situations, as they can easily evade attacks and take effective actions to injure their opponents. Therefore, the most appropriate explanation from the context of the interpretation given by Thread Upgrade is a misinterpretation. In addition to committing the
Half-Truth Fallacy, the interpretation also contains the
False Dichotomy Fallacy. That means they inferred Amado's meaning of saying Jigen's power was only 10% because that was how it started, when there are more options that make more sense than that. The more plausible interpretation here is "chronologically", in short in a mutually relative manner as I explained above.