I am in C ....woot woot.
For those who randomly get placed, I think they must have to take some of the people who don't turn a time in and just disperse them among the other corrals since there are probably more of them than the timed spacing of porjected pace. Its not guaranteed, but it happens. If you are not comfortable with your corral, thinking you are too slow, you can either start in the back and stay to the right - be courteous or move back to a different corral. Consider it some extra pixie dust!
For those who randomly get placed, I think they must have to take some of the people who don't turn a time in and just disperse them among the other corrals since there are probably more of them than the timed spacing of porjected pace. Its not guaranteed, but it happens. If you are not comfortable with your corral, thinking you are too slow, you can either start in the back and stay to the right - be courteous or move back to a different corral. Consider it some extra pixie dust!