Hebrews 2:10

For it was fitting that he, for whom and by whom all things exist, in bringing many sons to glory, should make the founder of their salvation perfect through suffering.
(Hebrews 2:10 ESV)

Jesus was the perfect fit from God. God, the author and sovereign One, provided a perfect salvation. And this was a plan to save many to heaven. Jesus is not just the one that carries it out, but he is called the founder, the author, the source. Jesus did not become perfect through suffering nor was his exaltation a reward for suffering, but he is complete and fully qualified through suffering.