I mean there is friendship and then their is love and then lastly their is sibling love
siblings usually barely hind things from on another and grow and help one another
if they do hind some stuff usually it effect the other sibling..... a sibling bond is overly closer then a friend bond
I mean Sarada could get/or be really close to ChouChou and Mitsuki but taking the gigantic step of being like siblings is overly hard since siblings know each others flaws and what they're thinking/hiding sometimes
Sarada and ChouChou could've grew up together but both have seperate families to go to and stories and bonds of family untold to the other.... Naruto and Sasuke shared common ground, later lacked family, and had that extra boost of being reincarnated brothers
I started talking about him because they are on the same squad and are more likely to go on missions together. With that being said they are more likely to bond faster and have a stronger friendship. ALSO, if one of them were to die infront of Sarada it would most likely be Mitsuki or Boruto, not ChouChou
well I get our point of Mitsuki being a trigger but it would be overly hard to have that (really close and friendly) sibling like bond
I mean they're ninjas and a comrade dying in-front of you may be a accelerating push for that time (she may even get 3 Tomoe) but what about after that?
would she hold a grudge like the other Uchiha and later let her hatred fester into something more? (which leads to high end power) Or would she just be hurt but not transform her lifestyle/dream because it....
I mean maybe for Boruto... if she loves him as much as Obito loved Rin
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I mean it is easier for Kishi to repeat his same old parallel with a sibling since that super love would be a breeze to use but the other stuff he'd have to try up some new ideas