Board Thread:Theories and Speculation/@comment-34661853-20181111160651/@comment-26422475-20190112072531

Maybe it can be more complex than just sharing chakra, perhaps Hagoromo handpicked the gifts he gave to Naruto and Sasuke?

Remember that Itachi more or less gave Amaterasu and Tsukiyomi to Sasuke even though Mangekyo traits were supposedly unique (are they unique to the individual or to the family unit? It was never clarified).

Or perhaps the sharing of chakra can activate latent potential, which is why certain gifts remain while others don't (such as the rookies and the kyubi cloak).