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JMHO, looks like ring blow-by and uneven skirt wear. I would check the ring lands for wear and cylinders for taper.
Again just my opinion, but it's probably time for boring and new pistons.

You still need to determine what caused the skirt to break, they don't normally break on their own.
JMHO, but I suspect too much taper wear at the bottom of the cylinders.

The bottom part of your piston is the skirt. Was this bored and new pistons, or just new rings? Was the cylinder taper measured? Looking at your cylinder picture again, #2 & #4 piston tops appear...

I'm glad you pulled the pan. Now, you need to discover what caused the piston skirt to come apart. In your picture of the cylinder, is it a shadow making the clearance around the piston appearing to...

By your statement above, I'm assuming coolant got in your oil and circulated with the oil through the motor. Bearing surfaces and coolant do not get along, before I tried to spin the motor anymore, I...