Not surprised you would see one 'man' as more important as another. It comes from man made teachings.
So let me introduce you to JESUS The Word and what HE says. After all, you will be judged you by HIS WORD. "Blessed rather are those who HEAR the Word of God and OBEY it."
And the apostles did hear Jesus and obeyed Him - as we are also commanded to do. So don't take someone's 'assignment from God' and judge who is greater! That is 'man's' thinking which leads into error.
NOW, who do you think could possibly be a successor of GOD? What god do you know can ever succeed The ONE who always was and always will be, The Almighty God? Who would dare claim to be His successor?
Well, I do believe that one man can be more important than others. After all, Our Lord chose some men to be more important than others, and Peter the most important of those.