Metal shavings in bendix and stator gear

[GG221]

Last ride my starter wouldn?t work at all and made a horrible grinding noise and wouldn?t engage. At first I thought it was from the first picture of the broken lead on the starter. Just figured the starter wasn?t getting enough juice to turn everything because of the bad connection (maybe this is what caused the next problems?). Today I pulled the stator cover off and saw metal shavings on the magnet. Then I looked at the ring gear around the stator and the teeth are worn and have metal missing from them. Very noticeable on some teeth. Same with the bendix gear. I recently did the wet mod but have ridden a few times since then and the starter had worked great until this last time. When I pulled the cover the oil was clean and the gears all are lubed. Any ideas what could?ve caused this?