monitor-slave model

[mu dongliang]

Hello everyone,
    I am a newbie about openssh. I have seen privilege separation mechanism in openssh.
    I did some small experiment in my Debian Jessie. I observed that this privilege separation use monitor-slave model (1:1). I am curious why openssh implements this with monitors-slaves(1:n)!
    I doubt whether the former is suitable. And I think the latter is more like real world.
    What's your opinion about this thought?

    - mudongliang