I could initialize mission 5 while backtracking in mission 16 by a similar method i used for the M5 Twin Mod. This is the interesting result.
Since all doors are open at that point Kuhlman is able to leave his section and sometimes running around or hiding like any other human npc. But the mission can't be orderly completed even if he survives, the opening of the escape elevator will never be triggered.
I used Debug Checkpoint Mod for this.