I don't see an On the start of layout event so for this you can run a special function, maybe pick all operators and get them to find a path? Depends on how your game works.
I resolved it alone by doing a global variable called start and that if is 1 they start all if is 0 they start alone.
But sometimes they choose the same object how can I put a random but not choosing the same because random can happen the same. I use to pick a random instance but sometimes they choose the same and it bugs