Russ,
Here is what I have experienced...buds and leaves without roots usually don't make it for me. Roots, even without buds or leaves always seems to make it(the leaves eventually come). The roots are what the cutting, and eventually the tree uses to draw life(nutrients) out of the soil, water, etc. If I had my choice between roots and leaves, I would take roots every time. If I were you, I would leave your cuttings in the spagnum moss until you see roots.