What is conclusive, unless a scientist or chemist you cannot tell me in all assurance that similar ingredients used could look similar enough to suggest a product is the same.
I believe there are just as many items that can "support" this claim as "deny" this claim. I too have read the many rumors about Brothers Inc and this and that, only to see just as many unsupportive facts. Thus a myth until proven or dispelled. Just watching Sal continue to invent new products, and consistently enhancing his products to a better level is what intriques me more. (remember I was not a fan of the original Z offerings, and not a fan of DG products in general)
I think the whole issue of private labeling is overblown in general. First, every commends C G for their products and yet anyone can buy them and offer them, infact several do. We also know that several use their base design and enhance it with different degrees of chemicals and ingredients. Does a change is color or scent make it different ?? Some say yes, others say no.
At the end of the day .... use what you want, and buy the product that fits your price point, needs, look, and outcome.