Hi toady
Maybe you would like to check is there any play in both the piston's wrist-pin holes. People tends to overlook this area which will also wear out. Try rocking the con-rod forward & backward while looking at each hole. If you notice any upward or downward(commonly is upward) movement of the wrist-pin then the piston is fried. There's always this misconception that the connecting rod(con-rod) 'stretch'. It's actually the big end bushing that has worn out causing some play which was thus misunderstood as the rod got longer. During most part of it's lifespan it is being pushed downward from TDC when the fuel combusted. The only time it will be pulled is during starting before it fires up while cranking when it is pulled from TDC where it is at the tightest spot.