I know there is a lot of thought that a rod bolt broke first, however because no metal went thur the engine, I think the failure started with a roller bearing seperater cage. The rod in this series engine the is crank supported and floats on the wrist pin. As the cage breaks down the pieces are trapped with rollers and only fine ground pieces can escape thru the lub slot in the rod cap. As the seperators break and rotate 90 degrees and continue to cascade results in a rod condition like a rod without a cage loaded with missing rollers.
The rebuild will be with a new set of rods.
Most importantly, I will not dry start again. With solid butterflys, closedon start the engine still pull air and fuel enough to instantly scream to 5 to 6 thousand RPM. Really unsetteling.