>they messed up how Aizens sword works
They did?
I'm pretty sure Itachi wasn't even trying in that instance
...I mean, I don't give Sasuke any credit for winning that fight myself. But I have always assumed, due to its legendary status as the unbreakable genjutsu, that Tsukuyomi's potency doesn't really run on a spectrum. It's kinda just on or not. You can change the intensity of the damage by changing the illusion itself (being burned alive is probably harder on the psyche than a single kick to the dick), but breaking out of it clearly has a bare minimum skill floor.
I'd also mention that Zetsu notices Itachi not fighting at 100%, but is still impressed when Sasuke breaks free of Tsukuyomi. And also that, even if Itachi let it happen, it is still evidence that the Sharingan can break as well as deflect genjutsu. And, finally, that the Sharingan's deflection ability is actually a named skill of the base Sharingan, separate from its other illusion-related abilities:
Magen: Kyō Tenchi-ten. And even them saying Aizen would be screwed due to "no illusions" was wrong as he immediately worked through and figured out Shinji's Shikai despite being just as ridiculous as KS.
lolololololol!
Holy shit, I'm dying!
Bro. Shinji's Sakanade turns on inverted controls for a single sense. A sense that you can literally turn off and still be a top-tier fighter, just ask Tosen. Trying to apply its counters to a fully immersive illusion like Tsukuyomi or KS sounds like giga-cope.
What exactly about Aizen's counter to Sakanade would even apply to a full-immersion illusion? All Aizen did was ignore his visual input and act in accordance with what he knew was actually happening. He could do this because Sakanade follows a very specific rule that only changes a single variable.
"Shinji appears to be coming from above swinging left to right, but I know that means he's actually coming from below swinging right to left." KS and Tsukyomi can make it smell, taste, sound, feel, and look like you are at the bottom of the ocean being molested by a Kraken. What exactly is Aizen's logic here?
"Well, every sense I have says I've been shoved waist-deep into Kraken twat, but I know...jack fucking shit because every tool for situational awareness I have is telling me I'm halfway up a giant crabs cooch." Sure, maybe he knows he's not actually being used as a crustaceans sex-aid, but that's
all he knows.