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I think I see the flake specific difference in patina that you are questioning, and can see no other reason for it other than what I think you are suggesting. It looks like a point or tool that was made, and then at least hundreds, if not thousands of years later the artifact was re-worked and shaped into what we see now. Some of the previous surface of the point can still be seen in the darker or browner areas.
I have a few tools and points with the same situation, and had been thinking about bringing this topic up myself to see what everyone else thinks about it.
I would think that the point now is probably an early archaic Kirk type, which makes me suspect the original form must have been really early archaic, or paleo??