@Devil:
This. That's what i think too. Poor Sanji, he had the worst training ever, his reaction in FI is obvious.
What i meant in another post with "good old Sanji is back" was about his badassery, i never stop liking him in the series.
Sanji's training wasn't the 'WORST'… he just had the WORST time during the Two Years
--- Update From New Post Merge ---
@Supernova122:
Only (definitely) true for Luffy, because he's rubber (supposed to be like rubber galvanising). When others have used Haki (Amazonians, Rayleigh, Sentoumaru . . .) we haven;t seen any going black. Anyway, we already saw Vergo's coat and bamboo stick go black when he hit Law, so it's not anything new . . .
Remember that was PRE-TIMESKIP and HAKI was not that well known to us the readers. Plus, having HAKI invisible (in colour) to us the readers, kept us in the dark and gave ODA time to mould it into something and truly reveal what it could and can be POST-TIMESKIP
Plus… Rayleigh and Sentomaru didn't really use HARDENING... they just used Haki
But we'll see once ODA does clear up Colour of Arnaments Haki with another explanation, maybe in an upcoming SBS or hopefully in the MANGA