Corojo and Criollo are tobacco plants. Ligero is a name for a leaf found on the plants. Volado, seco, ligero, etc. refer to the specific location of the leaves on the plants. Ligero, which I think means 'light', refers to the top leaves, which get the most sunlight and are therefore the strongest.
So it could be a ligero leaf from a corojo plant (if corojo plants have ligero leaves, I kinda thought their top leaves were called coronas or something).
I believe that one of the lower leaves on the corojo plant is referred to as a centro ligero leaf. That could be the answer to your question.
TYLER