The others are fine. This one was damaged by *something* although I'm not sure what. Unless the connecting rod gave way (AFAIK it didn't), the piston can not hit the plug. However, the engine may have bent valves, which the piston did hit. I've pretty much written the head off as a total loss, however I'm hoping the cylinder doesn't look like the spark plug!
This engine does not have sleeves. If the cylinder is badly damaged, it will need a new block.