Darcmon and Hippogriffomon were both slide evolutions of Murmurxmon. It’s pretty well established that a higher level Digimon can disguise as a lower level - see also Astamon pretending to need to evolve from Psychemon.
The thing is that Murmukusmon is also classified as a Demon Lord Digimon and described commanding thirty legions of demons making him only slightly lesser to the Seven Great Demon Lords themselves.
Tuwarmon on the other hand was never treated as being especially strong even by Level IV standards, nevermind comparing him to OmegaShoutmon or Cho-Hakkaimon.
Plus ninjas by the very nature of their job are not really fighters contrary to what popular media would have you believe and in fact actively avoid combat situations whenever possible specifically because combat, especially prolonged, is a
death sentence hence why ninja themed Digimon have all been Level IV.
other than its intro in Xros Wars (it’s described as a god, it should be Mega), Perfect makes sense for Deckerdramon for me (why is it Champion)
I get that it’s so it can evolve directly to Troopmon, but Chikurimon looks so, so much more like a Baby II than a Rookie
The thing is that the narrative element
@Bancho describes regarding Level V had largely been subsequently dropped long before Deckerdramon was even conceived.
Regarding Chikurimon the same could be said for both Salamon, whom I actually thought was Level II before learning about YukumiBotamon being Gatomon's Level I stage because of how baby-like it is, and Otamamon who was referred to as a Baby Digimon in Data Squad and is based tadpoles which are the larval stage in the life cycle of many amphibians.
Didn't stop them retconning Herculeskabuterimon, hououmon, rosemon, magnadramon, jijimon, and machinedramon from ultimate to mega when mega came.
They also retconned both Mechanorimon and Minotarumon into Level IV and Syakomon into Level III.
But let me tell why I have that idea above. It's actually because I think in every level Shoutmon should have two Xros forms without extra. By extra I mean Spadamon, Knightmon, or Beelzebumon. It's just beautifully neat.
X2 and X3 are Adults.
X4 and X5 are Perfects.
X6 and X7 are Ultimates.
Also the Profile of X4.
I like the take. Thank you.
I do get the logic since it would also put X4 on equal footing with both MetalGreymon and DarkKnightmon as the three main DigiXrosses of the series and the main DigiXrosses of their respective factions so I'm a little surprised they didn't do this.
The only explanation I can think of is that the Star Sword by itself is not enough to push X3's Level higher since it didn't boost regular Shoutmon's Level either and the Level V Xrosses all have something else in addition to the Star Sword.
This could also partially explain why Armed MadLeomon and DeckerGreymon didn't get boosted a Level in addition to the ZekeGreymon possibly being conceived as a Digivolution of the latter making having them be the same Level a bad idea.