I once had a head gasket blow between cylinders, so that is possible.
However, the numbers you describe don't seem to indicate that at all. If
two side by side cylinders had an opening between them, both would have low
compression numbers. Besides, if you had a gasket blown between cylinders,
you'd hear a peck, peck, peck as the air was forced back and forth from
cylinder to cylinder.
It looks more like you either have a valve problem, or, more likely, a
problem in the cylinder. It might be the compression rings in that cylinder
are broken, or the cylinder wall is scored, or even a burned piston.
I'm no expert, by any means, so take this message as my somewhat educated
opinion. Someone else could tell you how to troubleshoot the situation
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