Damn, Kitetsu's statement must be fake then.
Any blades that turned black will automatically raise one rank above its former rank. Yoru was probably the strongest 21 Great Grade Swords and become the strongest Supreme Blade after blackening. Same for Shusui, used to be 50 Rank but move up to 21 Rank after blackening. If Ace was blacken, it's automatically > Yoru.
"Even more perilous than trying to surpass me."
You: Becoming a PK doesn't mean to be stronger than Mihawk.
Me:
I guess Luffy doesn't want to surpass Yonko and Admirals then.
Agreed.
Roger is already stronger than Mihawk without a black blade. If Roger has a black blade, the gap would be even wider.