Do you think he would be playing as regularly as he is at Saints?
I take your point though. Maybe he will be first choice at a new club next season and performing on the European stage.
Personally, I think he had an average start to the season and has got steadily more consistent. I think his right foot is woeful and he needs to get to the byline more often. His shooting could not be much worse and he is injury prone.
Apart from this, top player.
If I was advising him I would say: "Get your head down, concentrate on your football and train hard. You are 18 years old and have a lot of time to improve. You are the number 1 left back in a young side that is being recognized and appreciated by the national coach. Sort your hair out and give twitter a miss."