SO MY guess is one zoro from another dimension (or universe) got lost again and came to another one piece dimension and that's why there are two zoros
Im on episode 346 the straw hats are trying to help brook YOHOHOHOHO remember kids THE ONE PIECE REALLLLLLLLL gEt wE mUcH hIgHeR sO hIgH oH sO hiGh gEt wE MuCh HiGhEr So HigH Oh sO HiGh I'm so weird T-T