"ghost" tabby markings just mean that the tabby gene is present in the background, but the cat won't produce a tabby. Some colors show more of faint striping then others - blue is one color, red or cream is another. Sometimes in the right light you can see it on a black cat.
Ling has "ghost" tabby markings - she was born a blue tabby/white but by 3-4 months old changed to black/white (yet to figure that out). In the bright sunlite you can still see the striping of the blue tabby.
I read that almost all cats are tabbies to some extent - not sure if that really is true.
If a cat is truly a tabby the striping will be a lot darker and not fade away; otherwise you get the "ghost" striping. It should change to solid by the time the cat is full grown; like in the Russian Blues.
Then he has a spotted tabby background. All tabbys will have leg/tail stripes - the difference is what tabby pattern is on the body. You have 4 kinds - blotched/classic (bullseye on the sides), mackeral (vertical striping), spotted, or ticked (like an aby).