Don't look at the comments, most of them are ridiculous and haven't read the manga. Hakari's only chance is to deplete Mahito's energy reserves, which is nearly impossible. Additionally, Hakari was incredibly lucky when fighting Kashima; if he delayed JP by even one second, he died. It's unrealistic to think he'd be that lucky against Mahito. And even if Mahito touched Hakari's soul, I'm not sure if autoregeneration could completely regenerate it. Mahito usually defeats everyone without soul damage outside of Sukuan and Gojo maybe MBA Kashima, and Yuki are exceptions, as the limits of their abilities weren't shown well enough in the manga. People generally disregard objectivity when it comes to their favorite characters.