Jesus was overwhelmingly the right Person. That's the argument the Preacher made for the Hebrews. In the first verses of chapter 8, the Preacher tells how Jesus is operating as the high priest in a superior manner. Two aspects of superior performance stand out in this. And second, the piling up of grand images means added emphasis on the highest, utmost, most exalted authority of Jesus.
Right hand is the place of power and authority.
The throne is obviously for a ruler. In the heavens. This is one utterly important person. Second, Jesus is operating in a superior place. The earthly priests may do their work in a tent or later a temple built by human hands, but Jesus operates in the true sanctuary made by God.