Be interested to see if Shelvey accepts saying words to the player but not the words attributed or if he is just flat out denying saying anything.
In terms of three different accounts, it's very rare for identical accounts to be given by witnesses so its not surprising to see slightly different descriptions. That said they all corroborate each other in so far as they consist of pejorative references to ethnicity. So whilst you couldn't say what words were more likely than not to have been said it's not a massive leap of faith to say it's more likely than not that he made a pejorative reference to Saiss' ethnicity.