Stop and think about it. The other cylinders have good enough compression to fire cylinders and not foul plugs, and not a one of them leak gas out the spark plug threads. But your dead cylinder in question does, and your thinking that is a good thing?? That it's doing that? Blowing air/gas out the spark plug threads is not in any way normal, and does not entail that there is no issue with compression. And definately not a good thing. And, no, it doesn't add up to eliminating compression as a problem. The other cylinders not doing that, proves that it shouldn't do that, it's not normal, and it is a problem and not a good thing.
A gas and air mixture enters the cylinder upon intake stroke. If that mixture is not fired, it is blown out the exhaust upon exhaust stroke. Even if valves are bad, it will do that anyways with a very high percentage of the gas and air mixture. Since it blows basically all of this out the exhaust regardless, it doesn't really build up liquid gas inside the cylinder, other than enough to make things wet. It doesn't pull in a mixture, and then shoot out nothing but air. What is blown out, is also a mixture on a non-firing cylinder. But it will retain enough gas in there to make things appear wet, such as your spark plug on the non-firing cylinder.
Liquid won't compress. Thats how hydraulics work. If you had a cylinder plum full of gas, it should be bending the rod, and not forcing it out the plug threads. If you had bad valves or rings, it should blow it through there, or be bending the rod before forcing it out through threads. Even if it did build up some liquid gas in there while running, it wouldn't build up enough to hydrau-lock given the 1 in the 10 to 1 (or what ever) compression that you have. It wouldn't build up enough liquid gas in there to surpass the 1. Even if it did, the extra liquid gas added to one cylinder stroke, wouldn't be enough to cause what you say is going on.
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