Was there a reason to not use the specular at all in Unity?

The specular map when used in unity was to shiny, so @jgonzalez removed it and used the slider instead. The problem is the specular is then uniform across the whole model.

The color texture only has the diffuse color. What I think you mean is the color shading (the lighter color edges) is in the color texture but not specular (shininess).