Those plug's condition look pretty bad, all in all. The photos are clear enough, but it's the electrode and ground strap and the porcelain that has the info; it helps to be able to see down inside the end of the plug- but in this case it's really not necessary.
I'd say considering how well the compression test went, that it may be the guides passing oil.
Is there one side of the plugs that is fouled more or has heavier deposits?
The one plug that looks most normal is the top right (circled).
Driver (L) 1-3; (R) 5-7
Passenger (L) 2-4; (R) 6-8