Looking at Sasuga always makes me think of Rin, not just in a same-face-syndrome kind of way but also their hair does the same flippy thing, and even his personality is a bit bubbly like hers too.

Sasuga is Rin’s descendant is what I mean to say

like her and Kohaku’s kid/grandkid married into the water practitioner’s family or something when they were still prosperous I dunno.

Timeline wise the headcanon is flawless!