Oda also change how he draw the character after Post TS compare to Pre TS. Pre TS era is always Zoro who take the cut first, fighting bloodied battle, Buggy arc, Usop Arc, well you can say much during Sanji arc it the WSS himself, in Nami arc also and continue fight with Mr 1 and so on. After Post TS, Zoro doesn't fight get overwhelm win in FI arc, PH and Dressrossa. I guess credit should be given to Mihawk teaching Zoro then. But it completely different Zoro compare to Pre TS