The thing with Robertson is he does his current role perfect, but that current role does include not playing at times.
He's a spot start scorer and that's exactly what he lives up to. Scores every time you put him back in.
He still has a lot to clean up to become a regular. Smart, systematic play where you grind teams down with your cycle, defence and efficient passing is integral to winning cups. He still can't do this at an above average pace.
As a spot start goal scorer he is clearly elite.
With that said, his ceiling is very high if he can improve all-around.