Are all limbs required for jujutsu? Given the above question, please answer with reasoning first!

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Jujutsu is a Japanese martial art that uses unarmed combat to subdue opponents. Nick Newell, a congenital amputee, got his black belt after two straight submission wins. Fighter Aaron LaPointe has succeeded in martial arts with a fully paralyzed arm.
Therefore, the answer is no.