I served as an elder for just under 12 years. I was part of appointing several men to 'elders.'
I can assure you that 'holy spirit' has nothing to do with it. Here is what it always comes down to:
Service average over 10 hours
Is he a good speaker?
Does the CO like him?
Everything else is just noise. The elder arrangment is totally absurd. Most of them have never read the Bible, don't read the literature and have all sort of personal secrets/sins. Many of the men I served with struggled with porn. Their kids were complete train wrecks.