See the pics here.
https://www.dropbox.com/sh/2x8sooydron1ega/AAC7PbUbb4JUnrJRqf8nmGZNa?dl=0
Dunno what file format you saved them as but I couldn't view them.
The most common cause of what you describe is that the plug cap/coil is not seated correctly onto the spark plug.
That is why they are almost always bolted down these days.
Not being correctly seated leads to a second gap between the cap and the plug.
The arc there eats away at the top of the plug and generates massive localised heat in that area which cooks plastics and rubber seals turning them to carbon dust. The misfire starts when the arc has eaten away enough of the plug so the gap gets too big to easily arc across.