They won’t get coccidiosis until they are introduced the the ground. It comes from the ground. Wouldn’t they all be eating the same feed?
Only thing you’d have to worry about is bio security of the hatchery, but people add chicks from hatcheries to their own chicks all the time without an issue.
Thank you, that makes me feel a lot better. It's so easy to get attached to the ones you see hatch, you know?