There are probably a lot of reasons why not all fill at once ... like the batch proccess to update them starts alphabetically or numerically based on lsac number, test number, etc. etc. I'm no VET but from a comp. sci. perspective it makes sense that it takes time to update a database.
Welcome to the Roberts court! I honestly don't know, but it seems to me that if consideration of race can't be used in the assignment of students in grade/high school, then post-secondary education admission and race-based scholarships are the next under the gun.