It happened, but we don't know how it happened. We can't say Maki killed Hayate using a simple kunai throw or Gaara went back to base form and used Desert Coffin to kill that Sound genin. In a fanfic, sure, but not as manga fact. At least when Kakashi and his backups were down, we can infer Deva used Shinra Tensei because of the countdown (I think) and Asura buying time.
Oh, so everything that happens offpanel in the manga never happens? Gaara didn't go into Shukaku Cloak and own the Sound genin? Maki didn't kill Hayate? Orochimaru didn't kill the 4th Kazekage? And that's just examples from the Sound + Sand invasion of Konoha. I could go on and on. In fact, let's make it more relevant to the discussion. Kakashi appears under some rubble while Deva Path stands above him and surrounded by Konoha fodder. Oh wait, I can't assume that Pain took care of all of them because it all happened offpanel. That was probably Chouji who farted and brought the buildings down on everyone.
It's only a bigger problem because it doesn't support what you think. You think Jiraiya did better than Kakashi so you'll say whatever to make Jiraiya look better when the fact is, both did extremely well in their own ways. They're still able to give each other a run for their money and I think even without Kamui, Kakashi could still beat JIraiya. Jiraiya losing to Kakashi is not disgraceful, despite what people think; Kakashi is a great ninja.
In any event, I can't lie that it is bothering me to see people saying Kakashi was not enhanced and using it to look down on Jiraiya for being enhanced with sage mode. His enhancement might be weaker than Sage Mode, but it was an enhancement he was using, thus they were both enhanced. Kakashi has 1000 jutsu to chose from, and other formidable abilities, with much thanks owed to sharingan. So even if Sharingan itself does not compare to sage mode 1:1, it opened up the whole world of jutsu variety for Kakashi. If people are saying an unenhanced Kakashi was fighting two Pains alone, there is a bigger problem than my red text. If people are saying that Kakashi outperformed Naruto against Pain, there is a bigger problem than my red text.