[Coldsaturn]

There are actually two characters who sound like Caleb in game: Jeremiah, and then the guy Raf does the shady deal with in the Nest. It wouldn't surprise me because Caleb's VA had to wait a while between his first appearance and then his official comeback, and it makes sense to still use him elsewhere. There are other VAs that do multiple NPCs, although not the main cast.

Try listening here at 7:52 https://www.youtube.com/watch?v=LsRemY5qheQ, without any visual cue making you think of one character or another. I'd be lying if I said I didn't immediately picture Caleb in my head.