If he leaves in January and Mane and Lalaland are out with long term injuries, you'd be concerned about a top 10 rather than a top 4 finish...
Poch, Wanyama,Alderwereild(even though he was only on loan), Bale...moved onto better things since they left Southampton. I think the problems start when they join a club in the City of Liverpool.
Pickford started off well..he's in my FF team....but poor lad up for another relegation battle. If he was behind a top defence...he could grow as a player. Either Everton improve or I can see him leaving.