Why is it that Deku didn't fully give Kachan One For All in the movie "Boku no hero Academia: Heros Rising"?


I was watching the movie and in the final battle against Nine, all looks lost
for Deku and Bakugo until Deku offers to give _One For All_ to Bakugo.
Everything works out and they defeat Nine. When All Might is holding Deku in
his arms after the battle, Deku lets All Might know that he gave Bakugo _One
For All_. After that Deku passes out his _Full Cowling_ stripes (I couldn't
think of a better word to describe them) show up. All Might is relieved by
this. He says (and this isn't a quote) that he (Midoriya) didn't fully
transfer _One for All_ to Bakugo. I was wondering why this was and how it's
going to affect the plot of the story.

(I assumed at firsts it was for plot armor but I am starting to second guess
it. They would have made Deku go "Super Saiyan" and beat Nine by himself.)




As far as impact on the overall story goes there will be none whatsoever.
Anime movies made alongside an ongoing series being adapted from a manga are
almost always entirely separate from the established canon and are original
stores, therefore they are unable to make any lasting changes.

In universe All Might himself refers to Deku retaining One For All after the
battle as a "Miracle" speculating that whatever remains of the previous
holders within One For All didn't fully transfer the quirk to Bakugo, this
could be seen as somewhat similar to how One For All wasn't inadvertently
transferred to Stain despite him consuming some of Deku's blood.




As far as impact on the overall story goes there will be none whatsoever.
Anime movies made alongside an ongoing series being adapted from a manga are
almost always entirely separate from the established canon and are original
stores, therefore they are unable to make any lasting changes.

In universe All Might himself refers to Deku retaining One For All after the
battle as a "Miracle" speculating that whatever remains of the previous
holders within One For All didn't fully transfer the quirk to Bakugo, this
could be seen as somewhat similar to how One For All wasn't inadvertently
transferred to Stain despite him consuming some of Deku's blood.

