Yahoo:
"Ken Shamrock, scheduled as the opponent of Slice, got into a money argument with Elite XC officials before the show, and then, to blow off steam, did a training session in which he suffered a cut above his eye that required stitches."
So he's pissed about the money and then just happens to get a bad cut that puts him off the card and leaves them without a headliner? Sounds pretty implausible.