First-time poster here.. just a wild thought. KC acquired Cassel from NE and with the money he's making is not likely they brough him in just for backup. What I've seen, Thigpen has done quite good, taking in to account the team and lack of talent surrounding him (no O-line, no Larry Johnson, ). He might be available in an affordable price, until weaknesses of Cassel are being exposed.
I know he went 1-11, but 18-12 TD-INT isn't that bad, 3 of INT's coming in the first game. Even Tony Gonzales was lobbying for him.