zoro level power
Asura with 3 black sword>wb prime/roger/mihawk/asura with enma black/santoryu black>kaido/big mom/asura/enma black
Asura Zoro will eventually show up something new in its mode that copes with internal destruction Ryou, or eventually learn it too, why not. (Very likely).
I would totally love if Zoro also came up with something learnt during the TS training he wouldn't unravel yet thus far.
I mean why is Luffy the only one to have discovered G4 and yet Zoro didn't come up with something beyond Asura. It is totally possible imo.