I don't think I'd read too much into that "pool date" column. Jesse's had his type for 2 years, and interviewed in July. That would put him pretty much in the same boat with the top 5 or 6 guys on the list I reckon. I don't think the date you receive your "congrats" letter is all that significant. A buddy of mine who went to class in October got his letter about two weeks before I got mine, but he's months ahead of me. Another buddy had his type in March, interviewed in May, got selected by the same board that I did (July), finished his admin stuff in mid-August, and went to school Oct 4. I finished all type and admin requirements 3 weeks after he did, but so far I'm just a "maybe" for April.
In other words, I'll bet the interview and type dates are the "big guns" in the process.