He still never sparred with him after and even deemed him sort of unworthy due to losing an arm, and iirc Whitebeard noted that their battles were heard through out the grand line. Yeah, he's beating an admiral, lol. Anyone who can even come close to being as powerful as a yonko is spanking an admiral and commander.
I even spoke with him in DM’s, and he literally told me the scene makes it obvious that Fujitora + Kizaru = Shanks. Like you have Shanks on one side of the screen and it’s juxtaposed with the two admirals.
And Momonga didn’t even get knocked out, he just took a knee.