Well not actually bypassing, but it isn't plugged in to your alternate diffuse and the defualt diffuse is set to 0 since there are nodes plugged into Alternate_Difffuse. The Blending_Diffuse_Color (which is what provides the mixing of the texture and overlay) is plugged in to the 0 Value diffuse only. Which is why it's not appearing.

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Consider me insane if you wish, but is your reality any better?