Furyou Miko wrote:It was a tribunal - they were probably called in because the Fists would be suspected of bias towards their successor chapter. That part makes perfect sense.
Hmm... Well, that does make some sense. And the story shows marine Chapters have the means to do genetic tests on Geneseed provided they get access to samples.
But it still doesn't help a Chapter that doesn't know it's origins. They'd have to steal geneseed from others to test, or petition the High Lords of Terra (or the AdMech) for access to records of their lineage. As if it wasn't humiliating enough to admit you've lost your history! Even beyond the geneseed flaws that mark some Chapters the real weakness of marines is their pride. Admitting the shame of losing their records would be intolerable, asking for help in recovering them impossible.