There is a copper washer at the bottom of the bore in the head that the injector drops in, it's supposed to seal combustion gasses from escaping between the injector and the head surface. In your case this wasn't happening very well, see all the carbon buildup on the sides of the injector, that's combustion deposits/residue. If combustion gases can escape that way from the chamber, what's stopping clean air from doing the same? In other words your compression test number for that cylinder could be so low just cause the copper seal in question has been leaking for who knows how long, it would not necessarily meant there's anything wrong with the cylinder itself. If you feel adventurous pull #1 and #2 as well, wouldn't be surprised if they looked nasty too. Then pull say #3, #6, or #8, and see if they have clean bodies where they drop into the heads, if they look good then you have found your compression leaks in the forms of the wasted copper seals
The confused and dunno face were actually sarcasm, but I hadn't really thought much about what caused the buildup. I have a few copper washers from the return line kit from Conestoga that I can replace them with. I will give it a shot. I was suprised and really pleased to see some of the high compression numbers then I got to #7. Thank you for your diagnosis.