In my opinion I believe that another coating from the same supplier does not satisfy the dual source requirement. From our second simulation we saw that companies will produce different results based on their testing and production methods. If you take another coating from the same supplier they can produce that coating the same way they did their first one but with minor changes to the components added. If there is a problem with the first coating there will be a greater chance there is a problem with the second coating because they are produced with the same methods. A second supplier though can verify that even with different production methods that results and product will be the same. A second supplier will mitigate and reduce risks but it may also incur more cost and time in finding this second supplier.