Kakashi admitting he couldn't fully replicate the Rasengan was genuinely shocking, I always thought his Sharingan made him invincible with jutsu, but it makes me realize just how much of a genius Minato actually was. It's wild to think he created something so complex, especially when even a prodigy like Kakashi struggles with it; I'm left wondering if Naruto will ever truly surpass his dad with it.