This is 100% it unless the GP commenter had some red flags. This also happens for visa reasons outside of the US. I know of at least one person at a fairly wel

This is 100% it unless the GP commenter had some red flags. This also happens for visa reasons outside of the US. I know of at least one person at a fairly well known UK company that had to undergo the same waiting process. Generally if the position is ultra-specific compared to their other postings, it's for someone they have in mind.