Testament to Mihawk using a blade larger than himself using strong blade with the most gentle movements.
Exactly, He clearly Mastered both,
After Zoro trained with him, Oda used "Crossing of Six Paths" to reveal that Zoro can now combine both Styles,
He could make his Slash Big enough to Cut Kraken's Arm, while still Fast enough that each Sword Cut Twice, and that was just a Teaser,
All his Techniques were Upgraded thanks to Mihawk's Training,
Basically similar to how Luffy learned to Combine Gear 2 & Gear 3 (His Version of Gentle & Strong Blade), resulting in Roc Punch & it's Variants,
(So for example, Rengoku Oni Giri looks like the OG Oni Giri, but in reality Zoro learned to retain his Desired AP while striking with each Sword multiple times in same Spot)
If Mihawk is indeed Combination of both Peaks of these Two Styles, then We could be looking at someone who can use something like Mr. 1's Atomic Dicer (Attack that cut building into countless pieces) but with Pirate King Level AP or Scale, or/and He could target a single Spot but He hit it enough times that it technically becomes Unstoppable/Unblockable