We had multiple groups and plenty of other staff, they just wouldn't be assigned to my group. For instance, I might have the soccer field for a given rotation

We had multiple groups and plenty of other staff, they just wouldn't be assigned to my group. For instance, I might have the soccer field for a given rotation (we had several each day), and on the playground nearby was another group or two, supervisors inside, etc. Any kind of non-herding-children emergency would have been handled without issue. Fire could be an issue, though I'm not sure an additional staff member would improve the situation much--the problem would be the doorways creating choke points.