If you asked which of all the Hyūga Clan's Gentle Fist forms best matched Naruto's mental image of the Eighty Gods Vacuum Attack, it would unquestionably be the Eight Trigrams Sixty-Four Palms and its evolution, the Eight Trigrams One-Hundred-Twenty-Eight Palms.
That instantaneous eruption of palm strikes, as fierce as a storm and covering every one of the opponent's Chakra points, really does look a bit like the "Eighty Gods Vacuum Attack" in motion.
Naruto knew very well that, with his current mastery of Chakra nature transformation, he was still far from being able to cloak a pure taijutsu attack in searing flames or razor-sharp wind like some Ninja could—but that didn't mean he couldn't start practicing and preparing right now.
And he happened to know the perfect basic Ninjutsu to serve as a starting point.
If any jutsu required no hand seals and offered enormous room for improvisation, it had to be the Rasengan.
With that thought, Naruto stopped hesitating.
He raised his right hand, palm up, and calmed his mind completely.
Under his precise control, two streams of Chakra flowing in opposite directions instantly appeared in his palm and began to spin, compress, and collide at unprecedented speed and in completely random patterns.
Chakra light flared in his hand, emitting a unique humming sound.
There, slowly taking shape, was a stable, dazzling sphere of pure, high-density Chakra glowing bright blue.
Naruto had never actually practiced the Rasengan before; everything he knew came from memories and theory from before his transmigration.
Thanks, however, to long months of training with Might Guy and the delicate Chakra control he'd developed while awakening Wood Release, his overall command of Chakra was more than adequate.
Holding his breath, he tried to recall and replicate the exact shape and rotation of that remembered sphere.
Yet—pfffft—!
A sharp hiss, like a balloon being punctured, suddenly rang out.
The nascent azure Chakra ball in Naruto's hand lost its internal balance in an instant; the Chakra rampaged, spilling out uncontrollably in every direction.
The runaway Chakra turned into a gusty whirlwind that swept the room, sending papers flying and knocking light decorations by the window every which way.
Amid the chaos, Naruto's peripheral vision caught the glass vase holding a bellflower tilting over and plummeting toward the floor.
Without a second thought, he abandoned the collapsing Rasengan, lunged forward, and deftly caught the bellflower just before it smashed onto the ground.
The Chakra wind gradually died down, leaving the room in disarray.
Looking at the unharmed bellflower in his hand, Naruto exhaled in relief, then glanced around at the mess and shook his head ruefully.
This attempt had given him a clearer understanding of himself.
'Without the Nine-Tails' Chakra causing trouble, my talent for Ninjutsu can show itself pretty fully—no longer the hopeless kid who couldn't even manage a basic Clone Jutsu… yet it's still not as overwhelming, or as smooth, as I'd imagined.'
That was normal; the Rasengan was far more complex than ordinary jutsu and genuinely difficult.
At his current level, if he kept practicing he could probably form it instantly within an hour.
Still, showing the Rasengan in public would have to wait until Jiraiya returned to the Village.
The logic was sound, yet the thought left him stifled.
Knowing the path yet lacking a guide or proper resources, forced to slow his pace and wait—this feeling of being locked in an invisible cage, restricted at every turn, unable to grow freely… it was suffocating.
He hungered for power, hungered to break every shackle, but reality's walls kept reminding him that some things couldn't be rushed.
To Naruto, present-day Konoha was no longer the warm, harmonious family of the storybooks; it felt more like a vast, ornate but invisible prison.
Anbu eyes everywhere, the villagers' veiled rejection, the higher-ups' calculations and control—all were cold iron bars pinning him in place.
He felt completely out of place here.
Like a young beast raised in a cage, craving freedom, longing to breathe real air.
An old saying flashed through his mind:
"When fortune smiles, heaven and earth conspire for you; when luck departs, even heroes are not free."
He knew the time had not yet come.
For now he must endure, must stay hidden, storing strength within this cage until the "moment" truly his arrived.
And the fundamental power he counted on was Wood Release.
'If… if my Wood Release can reach even half the strength of the First Hokage, Senju Hashirama…'
Just imagining it set his heart racing.
'With terrain-altering might, the power to summon a Forest Emergence, I'd have the capital to face the whole of Konoha head-on and smash this cage!'
He had even weighed the worst-case scenario: making an enemy of the entire Village and facing its ultimate deterrent.
'Once I fully master Wood Release, I won't need to fear Might Guy sensei chasing me down by opening the Eight Gates Formation for the Village's sake.'
Naruto knew all too well how terrifying Guy's Eight Gates Formation could be: a power that could turn the tide of battle at the cost of the user's life.
Guy was a man who could kick out a finale in the opening act; right now he might be a bit weaker than five years later, but the gap to full-power Eight-Gate Guy was simply that he hadn't opened the eighth gate yet.
Even if his Wood Release achieved minor success, Naruto had zero confidence in facing the world-shattering "Night Guy" unleashed after the Death Gate opened.
A calm assessment told him that to even escape intact from Gate-of-Death Guy, he would need a space-time Ninjutsu on the level of the Flying Thunder God Technique.
Only instantaneous movement that ignored distance offered any hope of evading that strike.
Once the eighth gate opened, Guy could walk on air with Evening Elephant, sealing space itself.
Without learning space-time jutsu, how could he possibly fight Guy?
As for acquiring the Flying Thunder God Technique, Naruto knew of two prime chances:
The Mizuki Incident at graduation.
In the original story that was his opportunity to access the scroll of seals.
Precisely because he was waiting for that day, Naruto didn't dare maintain a 100% success rate with his Shadow Clones in public.
As for Sealing Techniques, he could just claim he didn't understand them; even if the Third Hokage took the scroll away, Naruto wouldn't worry—after all, the Nine-Tails had memorized everything.
The Konoha Crush Plan during the Chunin Exams.
When Orochimaru allied with Suna to attack Konoha and the Village plunged into chaos, its defenses and surveillance would drop to their lowest—perfect for slipping into the vault that stored forbidden jutsu.
Flying Thunder God was simply too broken.
Even in the later Ōtsutsuki era it remained an overpowered mechanic.