Dark spot on TF core steel?

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Hopefully someone here can explain this. Knife is a TF Nashiji (Shirogami 1). After a few uses a spot appears towards the center of the length of the cutting edge that is significantly darker than the surrounding patina. I've removed the patina twice and this darker patina always appears in the same spot on both sides of the blade. Any thoughts?
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Hopefully someone here can explain this. Knife is a TF Nashiji (Shirogami 1). After a few uses a spot appears towards the center of the length of the cutting edge that is significantly darker than the surrounding patina. I've removed the patina twice and this darker patina always appears in the same spot on both sides of the blade. Any thoughts?View attachment 165175
If I had to guess, I would say that is the part of the knife you use to cut stuff with the most. But whatever it is I doubt if it is anything to worry about if it isn't affecting performance.
 
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