What if a Successor for Judas Dies?

In the opening chapters of acts, luke is doing something that would almost imply peter's uniqueness, his primacy. And so whatif they do? They draw lots. It's not petrine monopoly, petrine primacy, but it's a collegiality. So all the apostles are participating in this act, but they choose saint matthias by drawing lots. But who is the one who gets up and addresses the crowd? Verse 14, peter standing with the 11. That's the key. He goes on and on about jesus, life, death and resurrection.