Using applesauce to sub for butter in biscuits
Adding butter to biscuits or bread is what allows for that flakiness in the crust and that creamy texture in the bread itself. Lard would give you the same effect -- it's pretty much the saturated fat that makes the biscuit taste so great. Substituting applesauce for the butter won't give you the same results. It will be edible, but it will be more like a quickbread or cake than the biscuits you were hoping for.