Potentially So Mizukage?
In terms of skill, Kagura Karatachi feels no doubt. After all, he succeeded in hurting Shizuma Hoshigaki. Yet when that happened, Shizuma was an instructor and Kagura was just a student. Compare with Boruto, who was shamed all out by Shizuma in his first encounter.
No wonder Shizuma warned his five friends that Kagura decided to fight he could defeat them all alone. Especially since that time Kagura already held Hiramekarei.
Chojuro the Mizukage himself seems to have prepared Kagura to be his successor. Therefore he offered Kagura to try Hiramekarei's test.
Your Browser Do not Support Iframe