Plug read, opinions needed

Not a lot to add really because I’m still building the new trailer for the boat and the engine is still on a pallet but I noticed something in another thread that caught my eye. In the thread @Rat Bastid started,
Excellent video
About Steve Morris showing a plug read from his giveaway big block, his plug has the exact same mark at the tip of the ground strap that 3 of mine did.
D768CBD0-5E74-4C31-A300-D30B0DF29EBC.png
This is the best screen shot I could get. Anyone else notice that?