Jonas you have not been assigned, you had been selected to be the new receiver of memory.
I can't believe it?
In this panel, Chief Elder had went from 18 which is Fiona to 20 which is Pierre. Jonas, which was #19 didn't get called up to get his assignment. This builds suspense because the character doesn't know want happened or what he did wrong to not get his assignment.
In this panel, basically everyone is confused on what happened, Chief Elder had never made mistakes. This continues to build suspense because through Jonas's head he is thinking about what could of went wrong? This tells the readers that Jonas is getting a rare and important job because he didn't get called up with the rest of the kids.
In this panel, its lays everything out and explains why he had not been assigned. In the Giver, it says that Jonas had not been assigned he had been selected. He had been selected because their can only been one Receiver of Memory in the community. This slows down the suspense and explain to the characters in the book what had happened to Jonas.