Another way to understand Heb 2:9 from the context of scripture, and that is, the foundation of the death of Jesus in the verse is the Grace of God:
9 But we see Jesus, who was made a little lower than the angels for the suffering of death, crowned with glory and honour; that he by the grace of God should taste death for every man.
And the Grace of God is discriminate, its not for all without exception though for all without distinction, of Gods Elect. Ex33:18-19
Ex. 33:18-19; And he said, I beseech thee, shew me thy glory. And he said, I will make all my goodness pass before thee, and I will proclaim the name of the LORD before thee; and will be gracious to whom I will be gracious, and will shew mercy on whom I will shew mercy
Rom 11:5-6
5 Even so then at this present time also there is a remnant according to the election of grace.
6 And if by grace, then is it no more of works: otherwise grace is no more grace. But if it be of works, then it is no more grace: otherwise work is no more work.
The substitutionary nature of Christs death was for a remnant according to the election of grace.