think once you are a team fighting for top 4 managers fear losing so if an experienced player makes a mistake its easier to take than if it was a youngster,Problem for all top managers is how? Do you drop Kane or Son? and if you do what about Lamela and Moura do they not get playing time ... when you have 200m of proven players for those positions already it's very hard to ignore them for an unproven 17 year old
FA Cup games, with luck a run out at Bayern Munich, and some very limited EPL substitute minutes is probably all he can realistically hope top get.
these good lads need 10 mins at end of games for 1/2 of season then get them on loan 2nd half of season to play in teams with men