Plot protection is:
Having all your bones broken on deaths door the being given some magical drug which has never been mentioned before if so why doesn't everyone just carry this senzu bean on them all the time. Then being back to 100% and then a magic sword drawing haki out to use AdvCoC when Zoro has never even show basic CoC. Finally now people are cheering in expectation of Zoro getting up again over some grim reaper plot no jutsu.
FYI I always expected Zoro not to be done the Orochi and Hiyori plot is still unresolved but the way Oda is making Zoro come back is just...
Hopefully it isn't a case of Zoro being fully healed yet again otherwise Oda is just pulling things out his ass. I want to see another 'Nothing Happened' moment with Orochi and Hiyoir witnessing it.