I feel a bit sorry for Barkley, he's not done much wrong other than want to leave and has conducted himself very well. If you try to take the rose tinted glasses off, financially he could have similar terms to stay, but it's a much better opportunity to win trophies in a short career. Lukaku and Stones left to pursue bigger ambitions, it's up to the club to agree terms with other clubs for transfer or match ambitions, the club has done neither.
Has been hanging over the club for over a year now, but we didn't give him a new deal when he wanted one. Koeman pushed him towards the exit, Koeman's exit was opportunity to bring him back in. Hiring Allardyce will not have given any hope of us making improvements in the near future, if anything it's pushed hopes of achieving things back a year or so.
We aren't matching his ambitions as a club, we've not shown him the respect of a key player and if you think we haven't missed him this season, you're watching a different game. He's not going to become a world great, but I can see him working well with Willian, Hazard and Morata and becoming a key player for them. He'll need game time to build relationships and understanding with other key players, but being surrounded by better players and more options will improve his game.