If you could see the mains in person, they look just like the rods to me. ok, well then the mystery is solved on this engine failure, but now the mystery is why the other two engines survived with .002 on both rods and mains. The last build used the same block(without the oil mods), same crank, same rods and the same oil pump and used 20/50 most of their lives. only difference being both other engines had full groove mains and were broke in on 15/40 diesel oil.
Sucks to see all the carnage man. I'm not much help in saying what caused it besides I'd bet it a culmination of several things vs just one thing causing this issue.
FWIW too, since Rotella went to the CJ-4 classification some 15 years ago the zinc content went way down. It and VR-1 still maintain about 1200ppm so using it vs what you used I doubt would of helped. The zinc content goes away with time and is broken down at your wear surfaces. Higher numbers means it lasts longer, but not necessarily meaning it's better. We're lucky in this day and age we have a lot of great oils to choose from.
Good luck.
