Do they not have inventory

They would have, but I guess this was so secret it took a while to cut through confidentiality and disclosure red tape? Clearly, the real processing time factor was to push the release into this episode.

I'm pretty sure Caleb didn't mean the things he said to Darem and Genesis.

For sure. But they're still true, or at least speaking to some true fears of theirs. SAM saw right through him, of course.