Alright, I ran this by one of the guys at work who used to race moto x, motogp, superbike, and everything else except enduro and supermoto, and ran a dealership for a while. Between looking at the picture of my two-piece adjustable crank and handling the drive-side bearing I brought in, he is completely sure that this was simply a poor-quality crank, probly a void or inclusion in the forging process.