This isn't an argument- 'could have practiced it off screen'.
It's like saying Luffy can use Nidai because he could have practiced it offscreen. Or, Zoro can snipe because he could have practiced it off screen.
Such assumptions are made when we have seen someone doing so. Like, we can say Sanji did some legs training even when Oda didn't show us or Luffy trained his Df abilities even if Oda don't show us.
Sanji never practiced katana since he left Germa because Oda never brought this up nor showed to us. So what you said is headcannon.
Not really. Luffy never was train to use weapons unlike Sanji with his background. It has evidence for Sanji using a weapon even a sword. Not really huge difference. His fight with Wanze is proof of skill in wielding a weapon.
Not headcannon, it's heavily fact. He doesn't need to show everything to show on characters when it's heavily implied and shown prior how he use weapon.
Mihawk use a knife on Zoro by skill, nut because knife was state if the art. It's Sanji's skill has for him more which can help him even with a sword, so not really unbelievable.
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The cook dude was fodder lol.
Mihawk beat Zoro with a knife due to the overwhelming gap between a newbie from east blue and a yonko in strength and skill. Kuina specializes in the 1 sword style, Zoro specializes in 3 sword style. I assume Sanji must specialize in dual kitchen knife style?
He hasn't had the need to use Asura.
Oh no I didnt forget that at all. I remember he was a failure of a killing machine and was pretty trash compared to his siblings. Ah yes of course the skills Sanji learned when he was 5 are on par with skills attained by Zoro over the time of nearly 2 decades.
At the time he wasn't. Cipher Pol characters were tough on the Strawhats, but of course they are stronger now.
Mihawk said it's more skill than power. He stated this already that even someone having powerful blade it weapon is useless if they aren't skill enough. Kuina shows it too at her age with always beating Zoro despite he has more blades and using power rather his skill.
Ashura could have been use already in his past fights in Wano, but never use it still. He at his limit, Oda never really mention it again after last time it was use.
You mean Zoro with 2000-3000 times of losing to Kunia and just as trash and failure too? It's not about them succeeding as kids, but when they grow up. Sanji learn how to use weapons from Germa training and Zeff's to use as adult in future as shown in Wanze's fight easily. Again skill, not power.