[ Dinic ]
If you want to send a "headmate in a mixed-origin system that was born a system whose personal formation was related to trauma and mental illness" ramble, feel free to send this.
Aside from wiki stuff, we also explain system origin as not always fitting in a strong binary. endogenic systems can have experiences close to traumagenic systems, and vice versa, not to mention how many systems are mixed-origin or outside of that structure all together. My system has so many different origins in it and we don't fit into any binary, heck the headmate typing this in and of itself doesn't fit into a binary.
I also know there is one term which is like "littlegender" which is claimed to be traumagenic only, but being a system little isn't a traumagenic only experience. Associations that traumagenic syskids might have opposed to syskids like "maintaining innocence" also aren't exclusive to traumagenic systems, we know plenty of trauamgenic kids who are trauma holders or act older in some senses, and plenty of endogenic kids who are innocent, and vice versa some of our non-traumagenic kids have trauma even if it didn't form them. There's no reason for this to be exclusive, kids are kids, and kids especially have experiences which tend to go beyond origin more than any other type of headmate.
For medical stuff, there are plenty of traumagenic systems who don't have DID/OSDD for one reason or another (i.e. not fitting distress and impairment, feeling the diagnosis doesn't apply, etc) and you can actually be diagnosed with DID/OSDD as an endogenic system! I think the exact wording in the dsm is something like "trauma is associated with DID/OSDD", but not causes it, and it's not in the criteria.