Yes, If Zoro can't even beat a mortally wounded opponent of Luffy on his own. Then Zoro might as well quit being number two of SH crew and be a part of mid trio. The gap b/w Zoro and Luffy is never that big to began with.
But still I don't even see zoro being that stronger then say vergo....
Zoro always beat the second strongest while luffy beats the strongest.. For example when ends lobby I did not see zoro or Sanji defeating lucci whereas luffy did etc...
Tbh if Jozu could get caught in parasite I don't see how zoro doesn't get the Sanji/Jozu treatment ... Even if he has a gear 4th counter part could he hold it for 40 minutes plus which was used to defeat doffy not to mention no one is here to gamma knife and injection shot doffy