How can Boruto handle a Chōōdama Rasengan?


We see that at the end of Boruto:Naruto the Movie,

> Boruto defeats the enemy by hitting him with what it seems a Chōōdama
> Rasengan (IMHO it looks larger than a Chōōdama Rasengan). I think Naruto
> infused some of his chakra in Boruto's jutsu to make it that big.

We see it took time for Jiraiya and Naruto to master the Rasengan, and Naruto
was actually the only one to take it to the next level by adding his wind
chakra (at the time).

So how can Boruto handle this large amount of chakra? Yes everyone says that
Boruto can easily beat Naruto if you compare them at the same genin stage of
their lives, but that doesn't mean Boruto is trained to manipulate such an
insane amount of chakra. How was he able to pull it off?




The only strain Rasengan users show is from the chakra required to create it -
It requires a LOT of chakra to create. Manipulating the chakra, while
difficult to master, doesn't seem very draining. Even genin Naruto was able to
spend entire days practicing the chakra manipulation part. Since we've seen
Boruto make his own Rasengan, we know he understands the chakra manipulation
part, so he can obviously handle using/attacking with it. He doesn't however
have the completely bonkers reserve of Chakra that Naruto has, so he can't
make the Giant Rasengan himself.

There's no reason to assume that the mechanics of the Rasengan change as it
gets larger, so Boruto's own ability to manipulate chakra flow should be
similarly applicable across all sizes of Rasengan.

I'd even wager that the manipulation part isn't particularly important, since
we see Naruto give his friends Rasengans of their own to use during the Fourth
Shinobi War, implying that it may be a completely self-sustaining jutsu so
long as there is a chakra supply.




The only strain Rasengan users show is from the chakra required to create it -
It requires a LOT of chakra to create. Manipulating the chakra, while
difficult to master, doesn't seem very draining. Even genin Naruto was able to
spend entire days practicing the chakra manipulation part. Since we've seen
Boruto make his own Rasengan, we know he understands the chakra manipulation
part, so he can obviously handle using/attacking with it. He doesn't however
have the completely bonkers reserve of Chakra that Naruto has, so he can't
make the Giant Rasengan himself.

There's no reason to assume that the mechanics of the Rasengan change as it
gets larger, so Boruto's own ability to manipulate chakra flow should be
similarly applicable across all sizes of Rasengan.

I'd even wager that the manipulation part isn't particularly important, since
we see Naruto give his friends Rasengans of their own to use during the Fourth
Shinobi War, implying that it may be a completely self-sustaining jutsu so
long as there is a chakra supply.

