What if Chris Tucker take MJ's character to say words he got with some other random people...
I mean, maybe Chris got this story with someone else and he thought it would look better if it happened with his friend MJ. Though he didn't remember MJ couldn't know about this "grunting" thing... but who cares about it, apart from US ?
Now, i can believe it's a clue, cause Chris is like the princess : anytime he speaks about MJ, diamonds and pearls come out of his mouth for only believers to get them !