Now this putting all things under him, implies that there is nothing that is not put under him. But it is plain, this is not done now, with regard to man in general.
Related Commentaries of Hebrews 2:8
Hebrews 2:8
8 Thou hast put all things in subjection under his feet. For in that he put all in subjection under him, he left nothing that is not put under him. But now we see not yet all things put under him.