Let's start with the sheer number of long plays Mizzou gave up in the passing game.
Before the Kentucky game, Barry Odom's defense was one of three teams nationally that had yet to surrender a 30+ yard play. Against Kentucky they gave up passing plays of 48, 24, 28, 28, 24, 35, 25, and 24 yards.That's seven 20+ yard gains not even counting the 48 yard sideline bomb in the first quarter that was negated by a holding/unsportsmanlike combo penalty that pushed them back to a first and 29 on their own 10 yard line. And Kentucky still scored on that drive.