Well, in the Great Crusade era, it's likely that the chances of a properly chosen initiate of making it into a Thunder Warrior/Space Marine might have been much higher. After all, the Emperor himself was still around at that time, and actually understood how the process worked, as opposed to simply applying it by rote. So, it may not have been as much of an issue which planets the applicants came from, and maybe of more importance that they were loyal to their primarch.
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