it would ruin Minato for me personally. it's better that he came from no special clans and lineage imo. I'd say Kushina is the so6p descendant. look how well Nagato handled the rinnegan. And the Uzumaki were wiped out (wouldnt be surprised if Tobi was behind that one aswell)
Agreed, sometimes part of what makes you special is not necessarily coming from something special but by building yourself up with your own talent and the aid of your companions such as Kushina in Minato's case. If Minato turned out to have links to the Rikudou Sennin, then he's less of a once in a generation genius and more a next in line kind of genius in my opinion.
Peace
Yahiko looked like minato and naruto. Tsunades lil brother, obito, jiraiya all look like minato and naruto.
People looking like each means nothing.
You theory is invalid
Unless there's something
trademark like the Uzumaki red hair, not just red hair, then appearances can be quite misleading
and entirely uninformative. I'm sure Kishi has only so many ways he feels like drawing people. Spiky hair, smooth hair, long hair, short hair, long spiky hair, short spiky hair, etc. Then add color. It's like when Naruto met his mom, and she asked him what you get when you combine Minato and her, "The Orange Hokage" lol,
Peace