What am I denying?
When was it said that his sword was a Kokuto?
Why should I pray it's not supreme? Is it gonna dethrone Yoru as the strongest?
It's Black in the official colors, and it's constantly Black in the Black and White Manga around his waist without any Scabbard, the bare Blade.. Yes if anyone doesn't acknowledge that Aramaki has a Black Blade at this point, they are simply scared to engage in that conversation..
Because Greenbull probably made his Black Blade effortlessly since it's not part of his main fighting style like Fujitora..
So he's just a liar then

:
Yes when it comes to him specifically, it's misleading info fed by Oda..
Just before that line he threw a Canon ball like a Laser Beam..
Then he goes completely easy on his grandson and his crew..
Nothing point to Garp not being in his Prime.. Or.. He still has Prime output capabilities.. I will say Shiryu's stab did more damage than when he was at his peak, and using ability make him spends more energy than when he was young, but his Power output at Hachinosu was at least 90% Prime Garp..