Kakashi is a lot, a lot faster than Jiraiya (a man who could counterblitz some V2 Bijuu landing Raikiri
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on them and has short reactions comparable to KCM Minato
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; outspeeded and outreacted Obito, who was physically as fast as no Shunshin KCM Naruto; has been called fast a lot of times, his speed is hyped even in databooks; could blitz Zabuza cutting his arm and piercing his heart in the same swift movement; could blitz Kakuzu and Asura Pain with a little distraction. And he has Sharingan/MS precognition to his side too. Raiden is made from two Kakashi (the original one and a KB) Shunshining at high speeds and with Sharingan enhanced reactions, it could slice through V2 chakra arms before they reached him from a short distance attacking from behind. Kakashi can simply blitz Jiraiya with Raikiri or Raiden without him able to do anything, feats show that he is a lot faster and he is blessed with Sharingan precog too, also even if Jiraiya could react, he sure as hell can't dodge a man faster than he is and with precog on top too... and he cannot even block, because Kakashi's Raiton would cut or pierce Jiraiya's Ranjishigami/Hari Jizo like butter. Throw in also Kakashi's superior intellect and pure skill/jutsu timing that tricked shinobi like Itachi, Pain and Obito. Kakashi can also preempt Jiraiya's Yomi Numa and reverse it on him like he did with Zabuza's Daibafuku, he also trumps Doton with superior Raiton and his own Doton, can defeat Jiraiya's Katon with far more powerful Suiton and even add Raiton to it; he can't defeat Gamayu Endan, but he can dodge it by Doton underground with relative ease. Sharingan genjutsu is another card, Kakashi's is on Obito's level and that's more than enough to mind**** Jiraiya at wish. Frog summons are screwed, even Preta Path was dancing around Gamabunta, Kakashi is a lot faster and can cut his limbs with ease using Raiton nintaijutsu, this is one who could fend off multiple Bijuu together with Gai, he LoLs at Jiraiya's summons. Current Kakashi kills base Jiraiya with relative ease, and he could defeat even SM Jiraiya with some troubles. Not that Jiraiya is reaching SM if fighting against Kakashi, obviously. And I'm not even factoring Kakashi's Mangekyo Sharingan. Kakashi can end the fight in the instant he decides to with Kamui, this should be clear as day.
Kakashi solos both scenarios without any need to use MS.