I get that, I look at posts on occasion and wonder how the structure ended up that way . . .
As far as 'distance' from a bloodnamed warrior, its really questionable and depends on the Clan IMO. We know the scientists order pairings between the lower castes and that children are also born outside those ordered pairings, the Clan non-warrior culture does not distinguish between them IIRC . . . but as each sibko washes out a majority of the wannabes, that is a lot of trueborn genes that keep flooding into the freebirth genepool. Its going to affect it the same way the preponderance of trueborns quickly outnumbered freeborn in the first generations of the toumans. And the stage of washout is going to affect things . . . a 8 year old Elemental washing out b/c they are unsuited to life as a infantry trooper (cannot be still, keep quiet, whatever- and how do you judge that with a kid?!) will not have been indoctrinated with the superiority of trueborns and iron wombs (ick, natural birth!!) compared to a washout that got as far along as Peri? I mean I imagine they get dumped into a creche for all the other washouts of that generation who tested down to scientist/tech/merchant/laborer or whatever. Those creches will promote pop expansion as a 'duty' to the Clan.