Ok however from a basic point of view what is the difference between black blade Shisui and Zoro hardening Wado lchimonji?.. The advantages seem minimal and not really a power up per say.. Unless Zoro break one of his swords when hardened the distinction is pretty much pointless..
If you are comparing a black blade sword to black blade sword I don't think there is a big difference between the two. The benefit to just possessing a black blade, not counting any unique benefits sword may hold, is a blade that can't be broken.
The greatest benefit to a black blade will always comes from obtaining the power to forge a black blade. My earlier post explained some of the known and possible benefits a character could gain from forging a black blade.
Zoro and Sanji will remain 2 steps behind Luffy
They won't get another PU this arc or become top tier
They will beat their 2nd YCs next arc which will boost them to low top tiers or admiral level at best
This ard was for them to catch up to WCI Luffy
Next arc they'll catch up to Udon/pre adcoc Luffy
At EoS they'll catch up to adcoc Luffy
You still pushing that Katakuri is stronger than King nonsense?
Remember, the same Luffy who beat Katakuri was completely destroyed by base Kaido. While a severely weaken and nerfed Zoro bested and scarred hybrid Kaido in a 1v1.