-o- Of course he had some Uzumaki in him. All those ninja clans came from him so yeah of course he gonna have some of that DNA in him.
It's entirely plausible, and highly probable too that familial clans existed during Rikudou Sennin's era since it was a time of constant war and the most prominent warring factions in Naruto are clans BUT those clans during the Sage's era were non-ninjutsu wielders
Despite what others think I find this to be an interesting thread. I thought the senju and uchiha came from the rikdou sannin and the uzumakis came from the senju Idk good topic though.
ANy spiral elements are overestimately connected to uzumaki? I dont think so, then how about spiral zetsu?