I have seen Mourinho talking about Troy Parrot and saying going on loan abroad or to the Championship would do him no good at 17. He just needs to look at how far behind in his development Harrop is in comparison to say Mount at Chelsea as a reason why a loan would be perfect.You are right in saying he is a much more talented player than those you have mentioned. To be honest he is probably one of the most talented players in our squad in terms of technique and touch.
But his talent, which I've never denied, needs to be shown and used efficiently.
His goal record this season is something that can't be argued with. But what can be argued with is his contribution to the team in other aspects such as defensively and creativity, which have been lacking since the moment he joined. He's 24 years old now. He needs to stop playing like a youth team player.