He was, and it earned him his transfer to Inter. Then everyone said he wouldn't make it at that level, but now he's important for them. So now he's impressing at a tournament again (well, this game, anyway), and people are talking about how the next step up will be too much for him.
There will be a next step up that's actually too much for Dumfries, but it's funny that every single time he goes to another club (also before Inter), the majority opinion is that's he's too limited for the next level - and every single time he's instead earned himself a promotion. Good for him! (Seems like a decent guy, too.)