To me, as well:
- Turn floor into rubber to save crewmates or act as a spring for high jumps
- Make opponents bounce off walls/objects and back into his attacks
- Give any object Luffy’s resistance to blunt attacks and bullets
- Make the Sunny immune to cannon fire
- Interesting combo attacks in which crewmates use rubber walls/floor to their advantage
Could be that Onigashima falls at one point (Kaido inconscious?) and then the island is turned into a giant bouncing ball and jumps all over Wano