What went wrong with these cam bearings?

Looks to me like they were either tight, or not lined up quite right. I've had issues with passages in the block not lining up just right before. I've had to modify the bearings or block to get the right volume thru them. Also, every time cam bearings get installed, the cam being run needs to be installed and if it cant be turned by hand, you need to clearance them. That's what it looks like. Without enough oil, it's just like any other bearings. Hot spots develop, and the layers de-laminate and come apart, making a bigger mess.