War Arc (not Rikudo obviously) Kakashi is far, far faster than base Jiraiya, as he could outspeed Obito (that was physically as fast as no Shunshin KCM Naruto and by extension as V1 Raikage), intercept Kaguya's bone projectile with his dash, combo with Gated Gai, react and move on par with Minato and counterblitz Sharingan and Rinnegan enhanced V2 jinchuriki hitting them with Raikiri. He also pressured with his speed Asura Path, the same that blitzed SM Jiraiya. He has Sharingan precognition and unblockable Raiton attacks.
So Kakashi can blitz Jiraiya with far superior speed, adding Sharingan precognition to better time his attack, and use Raikiri, Raikiri kunai or Raiden to cut through any Ranjishigami or Hari Jizo with ease. Kakashi is also definitely smarter and more versatile, has the elemental advantage (Suiton > Katon, Raiton > Doton, plus his own Doton); has Sharingan genjutsu on par with Obito's, while genjutsu is one of Jiraiya's biggest weaknesses. Preta Path could dance around Gamabunta, so the much faster Kakashi will definitely dodge every of his attacks and cut off his limbs with Raiton ninjutsu. Jiraiya is not making SM with a faster and smarter opponent pressuring him and even if you make him starting in SM, Kakashi would outperform him with a Raiton Kage Bunshin and then kill him with a Silent Killing Raikiri. Jiraiya in SM had to run away from Preta, Human and Anima, when Kakashi without needing the Mangekyo could trick and corner, and more than once, the much stronger Deva and Asura.
All that is obviously with Kamui restricted, Kakashi's Mangekyo Sharingan,, especially with his War Arc feats, is something really too haxxed for Jiraiya, as good as he can be. That would end the match in an instant.