If it happens, it happens. And then it will be confirmed Zoro needs to learn flow/destruction from within. It would be the only way to get to see if Zoro can cut diamond even though i doubt it happens.
Found an interesting post
S-Shark - Senor Pink (Swim-Swim Fruit)
S-Bear - Kuma (Paw-Paw Fruit)
S-Snake - Pica (Stone-Stone Fruit)
S-Hawk - Jozu (Diamond-Diamond Fruit)