Exactly he is a very promising player who has a lot of good attributes. ETH might add something to his game, he is a keeper for me.Yeah, he definitely has an engine, i think that moment you refered to was deep in extra time, like after 115 minutes of football. Wins a lot of important duels for them. I can see why he is an important player for them and it is not just for his set pieces. We can not complain about his work ethics.
I do not agree either with the people that says he is hiding. He makes himself available quite often imo but Forest are not playing through their midfield very often.