Yes. As for the question about will a head gasket leak yield zero compression, yes it will. 1 and 2 are going in opposite directions, and one is sucking up what the other leaks, at the same rate, limited only by the size of the blowout in the gasket. I've seen zero several times while I learned to replace a 2.6 headgasket right. I got lots of practice, and by delaying the fix, often eroded the leak into a bigun. Piston speed is low, too...

Not responsible for advice not taken...