Yep, he isn't small but just doesn't use his strength to hold off challenges. Needs to bulk up a little perhaps, and that should come as he matures.
He doesn't look that confident either, understandably as he is struggling. It looked like he was ready to run off even before his number came up for the substitution, though I guess he may have been told from the sideline he was being pulled.
There's definitely a lot of potential there but it's not happening for him at the moment.