I don't want to wade too far into this because ultimately it's the Rater that would assign it, so most of it is not my monkeys other than pointing out instances in the record(s) where the veteran is unemployed and has been consistently due to medical reasons.
That said, I work claims every day with 21-8940s for unemployability that have ratings lower than the statutory amount, which would be, by definition, extra scheduler. I've worked on a claim, then eventually saw the claimant again for a different issue, where they had been rated X% at the time, their grant for disabilities added 20%, and they also got IU added to it based on their medical notes, pvt notes, and present employment situation. This is for claims where the veteran is asking for IU consideration. If the bulk of the prior post(s) has to do with inferring at the rater level then Ill take my two steps back in formation and continue listening with my eyes closed. Have a good day, all. I'm in sessions for most of the day *ugh*