Mike Leach's Air Raid offense didn't disappoint in its SEC debut on Saturday as visiting Mississippi State upset defending champion LSU 44-34 in Baton Rouge, and quarterback K.J. Costello set a conference record for passing yards in a single game with 623. The previous record was held by Eric Zeier of Georgia, who threw for 544 yards against Southern Miss in 1993. "I'm speechless about everything that happened today," Costello said. "If you were to tell me a year ago today that I'd be sitting here, it's crazy." Costello came to Mississippi State this offseason as a graduate transfer after starting 25 games in three seasons at Stanford. His previous high for passing yards in a game was 381. Costello's 623 passing yards against the No. 6 Tigers was the 11th most in FBS history, and the most in a player's debut. His 60 pass attempts is the most by a Bulldogs quarterback. "I thought it was a really good debut," Leach...