I think ‘didn’t make the grade’ is a bit harsh. He is only a young lad, and one who lost a wee while with health issues. There is still a lot of time for him to become a regular Dublin player if that is how things pan out. These aren’t professional soccer players with a defined career path, with young guys, other things might have to be prioritised from time to time like college, work, career etc.
In general there are some assumptions in this thread about why he wanted to go, or how serious the desire was.