a youth might also be chosen to become an acolyte if he/she is a survivor of xenos/heretic/daemonic attack and found to still be free of any taint. (for example, inquisitor tyrus was the sole survivor of a daemonic assault upon his home and was thus taken under the tutilage of the inquisitor who banished the daemon!)
some acolytes might still be very young too - 10-14 years or so when they start their initiation into the ordos... (again, tyrus was just a boy when he was recruited!)
also as pointed out, a youth who is found to have powerful psychic potential can find himself recruited for training as an inquisitor!
and yes, space marines (especially librarians!) may become an excellent member of a high-ranking inquisitor's retinue. (though of corse, the marine will still owe his true loyalty to his chapter first!)
the relictors for example work very closely with many radical inquisitors - both sides using the other to further their studies into the workings of chaos itself!
cheers!
__________________
"Who are you to question my methods?! A 'Puritan' is simply a coward who hides behind a veil of pretended faith and denounces his loyal brother as a traitor out of simple jealousy!"
- Inquisitor Odion   |