The availability of people to move corpses away from the presence their God is one of the reasons why more than one person came to speak to the man on the throne even though all three of them knew the news.
It might sound silly but it is very important that if one or more of them is killed for the news they brought, there will be someone present to drag away their corpse. After all, some can't expect the man on the throne to clean up the mess he made.
The second reason why three people came to be three news is so that if one of them is killed, the news won't die with them. The presence of other people who know the news means that someone else can continue informing the man on the throne about the news.
The third reason why there is one person for each piece of news is perhaps a selfish reason. It is so that one person will be responsible for the repercussions of one piece of news and won't have to risk death more than once for sharing more than one piece of news.
