While this is speculative, I don't think this is something to necessarily worry about. My guess is that the higher GPAs but lower LSATs (especially at the 25th) is due to Cornell choosing the best of the remaining applicants. For example, look at user SVX in this post:
http://www.top-law-schools.com/forums/v ... start=1500
In it he says he was pulled off the Waitlist and if you search his posts the user claims to be: male, non-urm, with a 159 and 3.83 GPA (residency is "international" though) from Penn State. Also ED Cornell but moved to regular cycle.
Anyhow point is, with a class size of 200ish, Cornell may have taken quite a few people with similarity lower LSATs and high GPAs. Why? Cornell can "bury" the lower LSATs below the 25th percentile, which does drop the 25, but can afford to maintain their median. To a lesser extent this also explains the drop in the 75th. It also explains the higher GPAs as the medians are now higher.
Again this is pure speculation and a little educated guessing, but seend a reasonable explanation enough. No matter what WaitersIsland your LSAT is still worth the same if not more than it was before now -- unlike Chinese stocks. Just be glad tie LSAT isn't listed on the Shanghei Exchange