Erik Mona said:
I am considering keeping it this way, and I guess I'm looking for suggestions from the faithful as to why that might not be such a good idea. I should add that I don't have strong opinions on the matter, so my biases are clear.
--Erik
Grover and Alzrius are both largely correct. The vast majority of CE petitioners dumped into the Abyss start out as CE larvae, though the most solidly CE of them may immediately leap into manes given enough time. This is somewhat vague in the sources. CE larvae as default Abyssal petitioners before the Tanar'ri get to them are well established.
These CE larvae are then taken before the Nalfeshnee (those that aren't eaten or killed) and warped into Tanar'ri proper: Manes, Dretches, or Rutterkin. Or in the words of one particular source they are judged and turned into :food, slaves, and food for slaves. Some petitioners that start out as manes, and this is likely to be VERY VERY rare, may skip this process entirely, or just get a pass from the Judges.
Keep in mind that the Nalfeshnee of Woeful Escarand probably have a job split into two parts:
1) Judging and promoting new CE petitioners to the Abyss. As already mentioned, most are larvae, a fraction may be manes already before this point.
2) Judging and remaking larvae harvested outside of the Abyss. The majority of these will come from the Gray Waste simple because the Night Hags of that plane sell them openly, and the Yugoloths don't care because they don't have a link to petitioners anyway, and those larvae are very very easy to imprint with a new purpose and ethos because the Waste has already done its best to scour them clean of any vestige of motivation and self worth (the ones that survive that process become Hordelings, but that's another topic entirely). Larvae from Gehenna will be too lawful for the needs of the Abyss, and larvae from Carceri fall into the same place as Abyssal larvae mostly, they are imprinted with Chaos already and they're difficult to control and manipulate into manes/dretches/rutterkin simply by virtue of their chaotic nature already.