I agree about it being a general problem, but I disagree with Sanji being in it... his evolution is palpably and ironically, it's fair to the character and his own evolution, plus the human modification was introduced and explained... i
it would be forced, like, sanji wakes up coc in less than 10 minutes and goes off blasting the guys
zoro discovered that he had CoC, after 10 minutes he was already using his advanced form, not even in fairy tail this happens