My Cat rod bearings...

[Rawze]

Coolant intrusion will certainly make the crank bearings show copper quite quickly, but ...

It looks to me like someone did a crappy job cleaning the engine and keeping the bearings clean when they were put in the last time. Cleanliness is everything. That #3 bearing was not chewed up by the crank, it was dirt contamination of some sort. When you look at it, #2 is quite bas as well.

It also looks like the bearings have rusted at some point. - Are you sure they were not rusty when they were installed? - Maybe road salt got in during a filter replacement at some point?