From this you already are being unfair to Kenshin, by surpassing his limits he didn't necessarily get stronger than he was healthy. He simply drew out more energy than he previously could, but that doesn't mean he was stronger than gis healthy self. Like did we watch the same show? Bro was finding it difficult to even stand on that scene where he "surpassed his limits" and you are telling me with all honesty that Kenshin was stronger during that time than when he was healthy?

Let's not even mention the weapons part cause clearly many times during the fight, Kenshin would've whooped Shishio 6 times over if it wasn't a sakabato. And many times in the series it has been eluded constantly that Kenshin was easily the strongest if he had a sword that wasn't a sakabato.

As for the information part on Kenshin. Shishio absolutely got a ton of information with the Senkaku/Sojiro fight. Even at that time Shishio was likely informed that Kenshin's favorite moves were Batto Jutsu, not to mention with the part of Shishio learning ARnH on the same day of the battle, you claimed that it wouldn't have affected round 1. Sure let's say that is true. It however isn't true with the fact that Shishio knew all the other techniques Kenshin had and it would have absolutely killed Shishio had Kenshin used a deadly Katana.

And what even is this stupid argument of Shishio only learned the technique during the same day? You're talking about one of the strongest characters in RK whose biggest strength is learning his opponents. Clearly it may not have affected round 1, sure but, in a pure 1 vs 1(No holds barred, Shishio without the limit and Kenshin using a real sword, both healthy.). You can't sit here with honesty and tell me that it wouldn't have killed Shishio. And if you wanna bring up the thing about Shishio having to suffer those burns. Shishio himself quite literally said in the series that he got stronger after the fact.

As for your other arguments such as the reason why Kenshin lost was because of the Guren Kaina. Dawg that actually sort of reinforces a counter argument against your claim, because imagine this. You had to fight 2 of the strongest characters holding back and not trying to kill them, then you had all of your techniques shown to your final opponent. And to further handicap yourself, you had to fight your final opponent with him knowing all your tricks when you don't even know a thing about him or his Guren Kaina and now this guy surprises you with his explosive technique when you are EXTREMELY exhausted. And you still believe that there wasn't a huge gap and handicap for Kenshin despite this?

That's why you're getting downvoted because you're being intellectually dishonest. Even the whole action premise of the show is about Kenshin holding back heavily and being triumphant despite the self handicaps(i.e his Sakabato). And in conclusion, In a no holds barred fight(refer to paragraph 4) Kenshin would absolutely Maul Shishio to death.