I don't think you can add too many leaves to amend native soils. They will break down even without a green component as long as they're mixed into the soil.
I add many trailer loads of leaves and horse manure to my gardens every fall. My main source for N comes from cover crops. I think of horse manure as a conditioner, not a fertilizer.
Given the choice between leaves, animal manure or cover crops, I would choose leaves and the more the better.
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