That's definitely no low diff btw. If WW is defeated, mid diff is more legit.
- Jinbe used FBH
- Jinbe combined his Fishman Karate with Hardening too
- Used a special attack to deal significant damage to WW
- WW managed to pierce through Jinbe's Shark Skin + Hardening elbow.
Whether WW is out or not, Jinbe definitely demonstrated who is the superior combatant is. However, Jinbe definitely wasn't casual and used higher end moves to dominate the fight while being pushed back on a single occasion.
Also, CP0 literally said that Jinbe is a different beast compared to WW.
Jinbe is YC Lv. easily.