The problem is that Knight and the Ultimate 4 were introduced very late in the series so there isn't really a great place to slot it in between Rei's proper introduction in episode 10, Mienumon's antics, Leviathan's origin, the attainment of the Ultimate Grades, Rei's backstory, the introduction of the Deep Web, Yujin becoming an Applidriver, and the introduction and defeat of Sateramon.
It basically requires that Knight be established much earlier than he actually was meaning you'd have to move episode 33 as well which in turn not only potentially messes up the dynamic of the majority of these episodes as they took place while Mienumon was running things for Leviathan but bare in mind that we also briefly see Knight at the end of episode 32 picking up Sateramon's Chip. To put it simply, you'd have to rewrite between episode 12 and this episode while not losing anything that happened between these two points.
