It doesn't show people on IOE.. IOE pilots aren't qualified for any bid status until it's complete.. just shows people who are currently qualified in that bid status.

It isn't all that accurate though, they don't always update it because some of those people are out on medical/military LOA's . I find in ORD its always about 10 people off if you look at the 3XP, but it gives you a rough idea. ALPA has an interactive seniority list thats pretty cool but it isn't ever up to date either.

Your best bet is to get a hold of a 3XP for the base you are interested in.. then you can see exactly what you can/can't hold.