@Salah WG it's as you said, Mihawk can double his power (just like Hakuba is double of Cavendish's power and has the same eyes), so the only one able to defeat him will be the one able to triple his power (Asura).
@nik87 
Exactly! glad you noticed that too,
I never claimed that Mihawk just trained for Couple Decades & happened to Surpass Shanks/Roger in Everything,
I always believed that He was born to be Greatest Swordsman, He already had a Lifetime worth (or more) of Sword Training/Skills, so it was never a Fair Competition,
Mihawk probably at 5 Year Old was already better Swordsman than most Samurai or Knights, just like Vegapunk was born Smart, and Big Mom was born Stronger than even Giants ... etc it seems like certain Characters were just born to be the Best, as if They were chosen by Someone,
I can find you the Comment if you want, but even before Egghead was shown, i said that Lulusia Destruction was done by Vega's Weapon & that He was born Smart, because his entire Purpose was to create that Weapon, that's why He was chosen to be born Smart,
Mihawk is same as Vegapunk, He was chosen to be Greatest Swordsman (Carry Peak Combat Power) even before He was born,
And Egghead already told us how this is Done, Vega's Satellites for example aren't as Old as him, but They were Created/Born with Vega's Intellect thanks to Punk Records, now imagine what Void Century People were able to Create if Egghead was just a Mini-Copy of it,
I'm pretty sure there is a Record of People's Ideas (Ancient Punk Records), a Record of People's Skills, a Record of People's Physique (Which was confirmed to can be Manipulated by Food, which might explain why Big Mom is addicted to Food) ... etc
If Mihawk inherited his Combat Skills from such Invention, then i won't be surprised if Mihawk can pull any Sword Technique ever known to man, He might start Fighting Zoro with Divine Departure, Yahazu Giri, Ryuma's Hiryu Kaen, you name it,
And especially after seeing how his Group of Animals were Monkeys who mimic Combat, i have very little doubt about all this,
This guy might be sitting & farming, but his Mind & Body are actually Training Non-Stop (Just like Vega & Punk Records), hence why his Sword turned Black from countless Battles
