obito and minato.
minato becuase he wasnt even in his prime...and probaly would've been able to develope rasenshuriken, think about it, he could use rasengan by himself when naruto need a clone, so minato would probaly just need one clone to provide the nature transformation then wha la he does it, and im sure he wouldve got sage mode.
obito becuase, think about kamui and how kakashi can only use twice and getting knocked out, this is bebcuase he's not a uchia, if obito got ms or ems (big IF, but hes still a kid so he can still do alot of things) then he would able to do kamui atleast 2 times without breaking a sweat.