The Younger son is the Sage's "body"
life-force and physical energy(yang chakra)
you dont only need life-force and yang chakra you also need the seal he used and invented for the Juubi
once naruto took control over a portion of kurama's yang chakra his seal changed and reminded kurama of the sage's
this picture tells a lot about what the younger son or the sage's "body" is
the sage's "body"has life-force and yang chakra;Naruto's cloak is filled with life-force
so the swirls around the sage symbolize life-force flowing around him like naruto's
it also shows a scroll and a staff it's assumed that the younger son had the staff and that the seal the sage passed down is in the scroll
younger son holding staff and hashi wearing the scroll
uzumaki's are also known for their powerful life-force
in conclusion:the reason naruto looks like the sage is because he has the sage's body which is the seal,life-force and yang chakra
life-force and physical energy(yang chakra)
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this picture tells a lot about what the younger son or the sage's "body" is
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it also shows a scroll and a staff it's assumed that the younger son had the staff and that the seal the sage passed down is in the scroll
younger son holding staff and hashi wearing the scroll
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