I think it's pretty clear that there's a clash of personalities between the two of them and that Leroy's a bit of a handful when it comes to man management. I get the impression that he struggles significantly more than the rest of the players to follow instructions, and that frustrates Pep quite a lot. The way I interpret it is that if Leroy decides to stay, then that means he'd be willing to learn and grow,and to take on the challenge of developing in the same way that Raheem has - and in that case, Pep and the club would be willing to give him that opportunity. If he decides to go, then it's clear that he's not interested in any of that, and therefore they'll be more than happy to let him go for the right price. His best trait is his potential... if it doesn't look like he's going to reach that potential here regardless of how much Pep and the coaching staff have tried to help him, then Pep will let him go without much of a fuss, imo.