1. Interesting that the account goes out of its way before Benjamin's speech to say they didn't count the crowd, but once the covenant has been entered into, the covenanters' names are collected. It's almost like it's a deliberate enactment of the Day of Atonement idea of two books -- during the ten days of probation, no one gets recorded, and then he has the covenant people's names written in the Book of Life.
2. As of this moment, the King is the head of the church.