Gyan staying down and pretending to be injured was the catalyst for the Heskey sending off.
FWIW, I feel it's the hypocrisy of the players - and to a certain extent alot of the fans - in making such a song-and-dance when the opposing team don't kick the ball into touch as soon as one of their players stays down for more than 5 seconds.
Everyone in Villa Park knew that Gyan was not injured. He was a fraction slow, got caught in possession & munched by NRC - fairly. Rather than accepting that, it's far easier to stay down, feign injury and start the sequence of events that, stupidly, left the Villa with 10 men.
Similar tactics by Gomez in the game with Tottenham.
IIRC, an innocuous clash in the six-yard box saw the no-good, cheating, slimy bastard go down, stay down and then, when the trainer came on, start rolling around like someone had just stamped on his gonads.
If only . . . .