What I found interesting is that the Fomor apparently have a classification system for powers amongst Mortals. Obviously, its not especially useful for this discussion because Harry stayed within one band, but I'll throw it out there anyway. If nothing else, its useful when analysing Harry's allies.
4 - "Sensitives" (The Big Hoods). No overt power, but capable of hearing ghosts.
3 - ?
2 - Mort, apparently. Someone with serious power, but not on the Council level.
1 - I'd guess full-level Wizards would sit in here, although it was never explicitly stated.
Now, who exactly would be a third-tier asset to the Fomor would be is up for discussion. I'd guess very minor sorcerers (Aristedes) and people with very specific talents. Maybe the Werewolves, although I'd argue that the Alpha's experimentation probably means they deserve to be higher.