The pitting I see there on the spiral gear is not what I call pitting. I don't know what to call it exactly but that does seem to be from stress. The gears messing together. It may be the same thing that I call pitting but it certainly doesn't look it from here.
The few gears I have saved that have pitting have the pits in a very irregular pattern, or no pattern really.
So that is the gear that gets replaced? Good deal.