2002 Gt - Oil On Electrode

First off, thank you for taking the time to read my post. I have a 02 GT that recently started misfiring. I got a CEL and it was for a cylinder 7 misfire. Removed the plug to find oil covering the entire electrode. Cleaned it off, re-installed and misfire came back in under a minute. I have parked the car and not driven it since. Before the issue came up, I did not notice any smoke, overheating or anything... My oil is clean as a whistle, coolant is also clean in appearance. I am thinking valve seals, but wanted to get some opinions before tearing it apart.
 
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^^^Id start with a compression test if thats good then most likely just a valve seal. Bad valve seals tend to just smoke a lot as oil drips into the chamber and rarely is it bad enough to fail a good plug out. A valve seal would pretty much have to be completely gone to fail a plug that fast and would smoke like a freight train. Bad rings also tend to smoke and compression wouldn't come and go as you stated... It could also be a combo of a bad valve seal and a burnt valve?

Oddly if you don't have a compression tester there's a old skool trick that involves poring a little bit of oil into the chamber to test for rings and burnt valves the idea is you poor a little bit of oil in and the oil will temporarily seal up the rings for a short time...

Anyway
You should also look into the reason why it did this a clogged cat could easily cook valve seals/valves/rings and would also hide some of the smoke