Kawaki is not same age as minato and team..He is at least 5- 7 yrs older than them... In the story kawaki and minato are depicted for same age....before minato enroll academy ,kawaki already died in anime
N3wman
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LIKEBro this is a fanfic... don't sweat the small stuff as not every little detail has to hold 100% to canon so kawaki could of just been born a bit later for all we know. Thats the cool thing about fanfics, the author is God and can do as he likes and if others don't like it they can just read something else as every fanfic is just written for fun and should not be taken overly seriously. :)
If you read the novel at the start properly you would have noticed him wishing to be born in minatos time at the same age and to be born as a senju with wood release. As there aren’t any other senjus to choose from to give birth to him, there isnt much choice but to make nawaki be born later on, as to why he didnt just make him a third child of the senjus idk.
A lot of people protes about nawaki age because you said mc want yo be reborn at minato age.. Minato and tsunade is way apart.. 13is years age gap.. So even nawaki isnt important.. Minato is important.. You will aging up minato age.. kushina too.. Even destroying uzu will come sooner in this case.. See.. its a lot of thing mess up because simple thing as age different.. Well.. i know this is fanfic.. But still...... not like this.. 😔😔😔
N3wman:I couldn't have said it better myself. Nawaki is not too important of a character in canon. Not much is known about him and he really only existed as character development for Tsunade. I decided to take the character and run with it to maximize my creative freedom