I am honestly unsure whether you mean all of these, mean none of them, or swap between the two between statements. I myself certainly don't agree with all of them.
"This Susanoo is destruction-incarnate, everyone who has seen it, has died."
This proves Uchiha Madara had the Perfect Susanoo long before he attained the Rinnegan, hence...his EMS version is all that he needs to stabilise and Perfect his Susanoo.
Actually, most everyone who's even met Madara in life is now dead, but that's beside the point.
Hashirama won. That means PS wasn't available in their great battle, or that Madara is lying. Timeline after the (1st) clash at the Valley of the End is uncertain at best. We've no real evidence either way, as the WORLD went on believing Madara was dead after VotE, and PS is NOT stealthy. Using it and remaining undetected seems HIGHLY unlikely.
"Yata no Kagami for defense, Totsuka no Tsurugi for offense, he is invincible".
Black Zetsu, the will of Uchiha Madara himself, who pertains all of his knowledge and original decisions, deemed the combination of those two weapons as invincible, hence.....the bearer of those weapons is invincible.
If you fight on Itachi's terms, sure. He's fast, skilled, smart and strong, and with CRAZY STRONG tools... But they have limits.
His stamina will not last, with the Susano'o active. His Sword is unblockable, but dodgeable, and not especially long-ranged. Susano'o is slow as well. Retreat and let him follow 'till he dies of exhaustion. If not...
His Shield will not cover every angle: sufficiently powerful attacks (Asa Kujaku and the Raiden come to mind, if he fights the Rivals, for example) from in front AND behind him will defeat him.
In his own words: Every jutsu has a weakness.
"I told you not to open your mouth so easily! You're just words and no actions, what someone like you says is worth nothing!"
Yes he has a great personality, yes he tries his very best, yes he is loyal to his village and yes.....he is super smart and elite! That still doesn't change the fact that Kakashi has never kept his word or promises, whether due to extremely bad luck, hesitation or pure lack of chance......Kakashi's words are not worth much.
He has always served the village, which is more than many have. Even those who faced less hardships than him. So his word is not worthless. And his nindo is among the most difficult of all.
"I don't let my teammates die." - Not easy to uphold, whether you're a twelve-year-old infiltrating enemy territory during a war or fighting A and S-rank shinobi. He has managed pretty well after Obito, as even Rin is arguable: She may have been no true comrade near the end.
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"He was known as the God of shinobi!"
Even though we haven't seen it, and many people don't want to believe it, Sarutobi Hiruzen, in his prime, was the strongest shinobi to have ever lived. I have put this fact here because Kishimoto himself has confirmed it and it is certainly believable seeing that a 70 year old Hiruzen who had lost most of his strength and chakra to his old age, sealed away 2 former Hokage, Senju Hashirama and Senju Tobirama, took away all of Orochimaru's jutsu, putting a dent in his plans for years, and leaving him whimpering and screaming like a child, at 70! Edo Madara is not included in this because he is just a soul wrapped in dust and earth and not a living breathing human.
I am inclined to agree, though how strong the Edo Senju brothers were is debateable. His only mistake as Hokage was caring too much, and letting Orochimaru live.
Edo Madara is the strongest being!
Whether living or dead, natural or abnormal, he has unlimited chakra, an indestructible and regenerative exterior, Mokuton, EMS, Rinnegan, Perfect Susanoo, years upon years of battle experience........Edo Madara is the strongest thus far and there is no denying it!
Naruto, if fighting SMART, could take him down. As could many others, though they'd sacrifice MUCH to achieve it.
Arguably there are many ninja that COULD solo Edo Madara: Naruto (if he used tactics, like a triple-pronged Bijuudama rush), Obito, Gai (Death Gate), Nagato, Itachi, Minato, (Prime) Hiruzen, Kabuto, Hashirama, possibly even Sasuke. Not saying any of these WOULD be able to
Here we have Itachi as well, which makes two of your non-debateable FACTS directly in conflict. How can that be?