Outstanding.

Perhaps the quick expenditure of your available blankets points toward a good use for the Mylar 'space blankets'. They are very light, compact and fairly inexpensive. All of which would allow you to easily carry a good number of them as an adjunct to thicker blankets.

They reflect heat and block wind but aren't very good at all at stopping heat loss by conduction. But for covering a body or adding insulation to a person with some clothing already on they work pretty well.

Generally multiple casualty situations highlight the need for depth in a first-aid kit. IMHO it is better to have a great many of a few basic types and sizes of bandaging materials rather than just one or two of each and a wider selection. Larger is generally more useful than smaller because larger units can be cut or folded to fit. The smaller ones are hard to stretch.