Walcott has been here over a decade and in that time you've hardly heard a peep from him. Despite him being an average/slightly above average player during his time, his professionalism has never been in question. Always looked to keep in shape and come across well in interviews.
For him to speak up about this must mean there's some truth in it. I'm inclined to believe him over Pires on this one, maybe Pires doesn't see all on the training ground.
Alexis doesn't help his case either with his child like behaviour at times. He clearly rates himself above everyone else, and rightly so in a way but shouldn't give him reason to be a dick to everyone if it's the case. Granted he is a proper winner, but you need stay humble as well without disrupting the dressing room, its part of being professional.
If Alexis is genuinely unhappy then just put in a transfer request and fuck off, no need for nonsense. Yes he is massive for us but we can't have individuals thinking they run the show, you'll get nowhere like that.