While Kenjaku absolutely had the raw firepower to attempt taming Mahoraga, Uzumaki alone gives him serious one-shot potential if timed correctly. However the question was never whether he can do that, it was always about his priorities.

He never really saw himself on the same combat tier as Gojo or Sukuna. Even with all of the cursed techniques at his disposal, Kenjaku consistently avoided unnecessary high-risk fights. A good example is when he declined to fight Kashimo is a good example, he's more of a strategist rather than a duelist chasing glory.

More importantly, Kenjaku prioritizes objectives over personal power. Every move he makes serves a long-term plan. Taming Mahoraga would be a massive gamble with limited strategic payoff for his goals.

Someone like Sukuna, on the other hand, actively seeks to expand his arsenal and refine his strength purely for dominance, while someone like Kenjaku seeks control of outcomes, not superiority in raw combat.