I think we have all the tamers era recolours now except for Silver Taomon and Kyubimon.
We're missing ChaosDukemon Core and Dukemon Chaos Mode if it counts.
I don't count them because they're recolours who only had one appearance. But Dukemon Chaos Mode is a really weird one, it only appeared once as a toy but nothing else.
A Western-only toy as well, unfortunately. Gallantmon Chaos Mode has never been acknowledged by Bandai Japan.
Granted, a Crimson Mode equivalent for ChaosDukemon isn't exactly a difficult concept. Nothing saying it won't be acknowledged as an official Digimon somewhere down the line.
Oh, absolutely not, and I’d be thrilled if they ever did acknowledge him - but it’s also been twenty-odd years since his toy was released, and the same arguments about a ‘ChaosGallantmon version of Gallantmon Crimson Mode’ being an easy concept could be said about a vaccine Sakuyamon, a data Gallantmon, or a version of Nanimon that looks like an orange…none of which have yet manifested/been acknowledged.
It’s absolutely something that
could happen - and I very much hope it does - but the chances of it are astronomically low, as no Digimon that has been created by a foreign branch has ever been acknowledged as official, since Ciel was created as a preventative measure by Japan. Plus, you know, there are pallet swap gaps all the time - not are only are there no Megas, but there’s not a vaccine Renamon or a BlackTerriermon either, and I’m still waiting on them remembering about BlackGuilmon.
ChaosDukemon and Dukemon kind of parallel Sakuyamon and Kuzuhamon. Both Sakuyamon and Dukemon have their own mode change with Miko Mode and Crimson Mode respectively. They did make a Kuzuhamon Miko Mode which made its first appearance more than ten years after Kuzuhamon and Sakuyamon Miko Mode. Maybe I'm clutching at straws here but thats the closest thing to evidence of ChaosDukemon Chaos Mode being remembered by Bandai is that we kind of have a precedent with Kuzuhamon.
Couple nitpicks there.
First, Kuzuhamon Miko Mode was a new Digimon, not an old one that had never been acknowledged. By that metric, we’d be just as likely to get a completely new Crimson Mode equivalent for ChaosGallantmon than them canonising Chaos Mode.
Second, Kuzuhamon and ChaosGallantmon have never really been intentionally played off as parallels against Gallantmon and Sakuyamon in the paired way that your post seems to imply. The two of them, together with BlackMegaGargomon, have certainly been used to represent dark forms of the Tamers trio, but largely they are used as parallels independent of one another - so just because Kuzuhamon has an equivalent for Sakuyamon’s other form, that in no way implies that ChaosGallantmon has to have an equivalent for Gallantmon’s. After all, Seraphimon/Ophanimon/Cherubimon Virtue are often paralleled explicitly against Daemon/Lilithmon/Cherubimon Vice, and yet while Lilithmon and Cherubimon both have entire digivolution lines that mirror their counterparts and branch from the same Rookie, neither Daemon, nor the occasionally substituted ShadowSeraphimon do (at least not in an explicit way - Devimon is definitely to Angemon what LadyDevimon is to Angewomon, but there isn’t a similar counterpart to MagnaAngemon (NeoDevimon and SkullSatamon can be used, sure, but no explicit parallel has ever been set up), and Devimon has his own go-to Rookie in DemiDevimon - he doesn’t share Patamon the way Gatomon/BlackGatomon and Turuiemon/Wendigomon do Salamon and Lopmon. Furthermore, Devimon is far from ‘Daemon’s Champion’ in the way that BlackGatomon or Wendigomon are, in that while Devimon is Daemon’s usual Champion, Devimon himself has many Megas and you’re more likely to see him become VenomMyotismon or DanDevimon these days, whereas BlackGatomon and Wendigomon do default to Lilithmon and Cherubimon Vice).
tldr;
Just because two Digimon are parallels doesn’t always mean one will get everything the other does (where’s Lotusmon Burst Mode? BanchoOgremon?), and Kuzuhamon getting a Miko Mode doesn’t really have anything to do with ChaosGallantmon as their connection is circumstantial at best.
And even if they do give ChaosGallantmon a new form, it is just as likely to be ‘ChaosGallantmon Indigo Mode’ and have different weapons and bat wings than it is to be Gallantmon Chaos Mode returning from the war.
(I’d also like to point out here that I’m merely playing Devil’s Advocate - I
really like ChaosGallantmon, and have wanted him to get a Crimson Mode equivalent for years. I’d also prefer they just use Chaos Mode, because I think the navy blue angel wings gives him a really nice ‘dark angel’ vibe, when we usually just get demon lords in Digimon. That said, though I want it, people seem to think that he’s a super likely addition or the like, when he’s in the exact same boat as Citramon or Kentaurosmon Burst Mode - Digimon created without the approval of Bandai Japan and, so, completely non-canon)