Killing Kenjaku will be impossible for Yuta, his defeat will be just temporary as well. He can recover, switch between bodies to change host, etc.
Like some of you said, Gojo thinks if others dont step up and become stronger, there wont be peace in Japan. He expressed this desire numerous times.
I wont mind tag team against Kenjaku, like Yuta, Itadori, Maki, or even Megumi.
To answer the question, Yuta can dominate the fight, he can make Kenjaku retreat or something like Mahito used to do (escape when he thought he is at disadvantage).
I still want to go with Yuta. I have my doubts, but it will be Yuta's major fight in the series, so he will either defeat Kenjaku, or get some information like Jiraya.
Either way, I am hyped for my boiii Yuta.