For all who are confused/concerned about corral placement...
1. Keep in mind placement is based on TWO factors: the estimated finish time you entered and, if you entered a time under 2:45, your PoT to back it up. So if you entered, say, an estimated finish time of 2:50, but a PoT that correlates to a 2:00, you'd be placed based on that 2:50 estimated finish, NOT PoT because they wouldn't even look at the PoT for a time slower than 2:45. Or, say you entered a 2:00 finish, but backed it up with a PoT that corresponds to a 2:30 finish - they may place you based on the 2:30 PoT or they may place you in the last corral because your PoT doesn't back-up the 2:00 you entered. The key is that your estimated finish time and PoT match up as closely as possible.
2. LOTS of folks entered finish times higher than 2:45. Enough that they chose not to put them all in a single corral. Some wind up properly placed in the designated 2:45 corral, but others will get moved to other corrals. I haven't seen enough of those folks to guess at how they determined who gets moved vs. who stays. May just be random draw.
3. You can't accurately compare this race's corrals to any other race's because the make-up of each race is different. It looks like this race has a lot of really fast runners who need to be placed up front - that moves everyone slower back a bit compared to a race that has more slower runners. The letter of your corral has no real meaning - it's really about where you're placed relative to the rest of the field.
4. What I don't know, and would be interested in learning, is what happens if you've entered a time slower than the 2:45 PoT cutoff, but faster than 3:30 - say a 2:50 estimated finish - and you submitted a PoT to back up that time, and you wound up in the last corral anyway. Would Runner Relations do anything to move you up if you showed that PoT that would place you in a different corral, even though it wasn't required? If anyone happens to be in that position and tries asking RR at the expo, please report back!