There are no issues. Curiel was one of the most prominent Commanders after the Top Ones along with Izo. In fact, he is more than likely stronger than Moriah.
These dudes just ain't anywhere near Jinbe's level.
Sure you're more than free to ignore the issue. But:
- Tobi Roppa don't have a set level
- The scenario between Curiel & Jinbei are two different scenarios. Curiel was taking on Moria while Moriah was using zombies (more than free to correct me). Jinbei put that to rest due to his water manipulation, forcing Moriah to rush at him, and Jinbei put him down. If Curiel had hit Moriah and couldn't take him down, you'd have a great point. You just have a panel of Curiel standing in front of Moriah, comparing it to a panel of Moriah who rushed at Jinbei and got hit by him, after his ability countered by Jinbei.
- Curiel might be a "prominent commander" out of the 16, his level is still unknown. Being shown the most doesn't equate to being one of the stronger commanders (just to keep in mind).
There's really nothing that's making Jinbei stand out from the Tobi Roppa, when the leader of the SWORD is in the Tobi Roppa.