Well, technically yes. If a valve is stuck open because of no rocker clearance, then there be no compression because of no air tight cylinder.
But, .... say the cylinder will fire at 70 psi compression. But not at 45 psi. And yours is at 55. Enough for the cylinder to fire SOME with an un-fouled bran new spark plug. But not, once fouled by wet gas because of not firing all the time because of inadequate compression. Then the dead cylinder never fires, because of not only bad compression, but also a fouled plug. At this point, there still should not be any leakage at plug threads NO MATTER what the compression is. The leakage only indicates one thing. That it should not have any leakage. And leakage can only be coming from bad threads in the head, or on the plug. Being a new plug, unlikely to be bad threads on a new plug.
For what it's worth, it shouldn't be doing that. And I'd wager a bet, that your other cylinders WOULD NOT do that if you ran the tractor with the plug wire completely off of any one of them you were doing the test to. And if they somehow ironically all did the same thing, then obviously someone has put in an entire set of the wrong plugs at some point. Shouldn't be no leakage. Leakage indicates bad threads or wrong plug, no matter how you slice it.
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Today's Featured Article - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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