Originally Posted by Garhert
Kakashi is not an uchiha in anyway, his sharingan is a transplant from Obito who was his team member who died during a mission in which kakashi lost an eye. Yamato is an experiment from oro, he was fused with the first cells otherwise he has nothing to do with the first so he isn't from that clan. I believe the first was the only ninja who could use wood element thats the reason tsunade doesn't have it, anyway that was the point of fusing his cells into yamato.