A few thoughts crossed my mind about a few things on the Hasbro side of RID.
It's no secret that Hasbro imported Car Robots over as RID to serve as a filler series while Armada was being readied for release in mid-2002. As such, it also served as a transitionary series to better the switch from the Beast Era to Armada by reintroducing Autobots and Decepticons to the brand. While the change from Maximals to Autobots was instantaneous, the switch from Predacons to Decepticons was gradual, with the line beginning with Predacons before introducing the Decepticons later. And as the line continued beyond the Car Robots offerings into Hasbro's expanded line, more and more Decepticons dominated the line as the primary villain faction, with only two new Predacon toys (Bruticus and Cryotek) being released in the line.
Though, something that doesn't get a lot of talk about this is a small subtlety that the dub made in conjunction with the toyline's Predacon-Decepticon shift. In addition to the obvious part of the dub renaming the Combatrons of Car Robots as "Decepticons", the dub also made a similar change to Megatron. When he was reborn as Galvatron, the dub had him declare his upgrade to be his "rebirth as a Decepticon". He also stopped using "Terrorize" altogether and replaced it with "Transform" like the Decepticons used. Likewise, Galvatron's toy was marketed by Hasbro as a Decepticon instead of a Predacon, despite the toy still having a Predacon Spark Crystal.
What I'm getting to in all of this is that Galvatron declaring himself a Decepticon in the show could potentially provide an in-universe explanation for all the new Decepticon characters introduced by the Hasbro toyline. Galvatron changing his affiliation from Predacon to Decepticon could be seen as foreshadowing for the coming of more Decepticons at a point set after the cartoon's end (supposing he eventually escaped his imprisonment, that is). The dub did also mention Vehicon Drones at least once, and two of the new Decepticon toys were redecos of Vehicon toys (Obsidian and Jhiaxus), so those two maybe could have been RID Vehicons given Sparks and identities of their own,* who then joined Galvatron's growing Decepticon faction. The rest with Earth vehicle modes (Wind Sheer, Skyfire, Dreadwind, Smokejumper, and Bludgeon [but not Axer since he's a dimension-hopped G1 Decepticon]) could have been either Autobot defectors or just other Predacons who willingly changed their forms from animalian to vehicular.
Then, the Destructicons could be a subgroup of what was previously itself a subgroup. In fact, if Scourge somehow got back his independence, the Destructicons could be seen as his own faction splintered off from Galvatron's Decepticons, making the two rival groups.
* -- The Autobots Storm Jet, Nightcruz, Mirage GT, and Scavenger could have likewise been Vehicon Drones given Sparks and identities.