Balsk is a warrior of great renown among his people, having survived many battles and could have easily challenged for the leadership of the Dragonborn if he chose to.
He did not challenge for the leadership because his older brother Kraygar
had done so and succeeded.
When Kraygar was defeated by Kava
and her group, Balsk would most likely have challenged them but Kava talked him into joining her side before he could contest her rule.
A fearsome warrior, Balsk has many scars but many have died at his hands.