It's difficult to definitively say whether Naruto could beat Luffy in Gear 5 without Kurama. Both characters possess immense power and unique abilities.
Naruto's Strengths:
- Vast Chakra Reserves: Even without Kurama, Naruto has significant chakra reserves, allowing him to perform powerful jutsu.
- Masterful Jutsu: He has mastered various jutsu, including Rasengan variations and Shadow Clones.
- Sage Mode: This mode enhances his physical abilities and senses.
- Strong Willpower: Naruto's unwavering determination is a crucial asset in battles.
Luffy's Strengths:
- Gear 5: This form grants Luffy incredible speed, strength, and rubber-like abilities.
- Haki: His Armament Haki strengthens his attacks, while Observation Haki allows him to anticipate attacks.
- Devil Fruit Powers: Luffy's Gum-Gum Fruit gives him immense elasticity and the ability to stretch his body.
- Adaptability: Luffy's fighting style is flexible and unpredictable.
Factors to Consider:
- Gear 5's Power: Luffy's Gear 5 is incredibly powerful, capable of warping reality and defying logic.
- Naruto's Lack of Kurama: Kurama's absence weakens Naruto significantly, limiting his power and stamina.
- Fighting Styles: Naruto's fighting style relies on precise jutsu, while Luffy's is more chaotic and unpredictable.
Conclusion:
The outcome of this hypothetical fight is uncertain. While Naruto's mastery of jutsu and willpower are formidable, Luffy's Gear 5 and Haki abilities are extremely potent. Ultimately, the victor would depend on various factors, including each character's strategies and the specific circumstances of the fight.