Question about pedigrees - Page 1

I'm not trying to stir up crap with this. I truly am curious. I've been trying to learn about lines, and while cruising around the ads came across this one. It caught my eye because of the Esko-Inzucht liner.

Here's my questions (in a round-about way). Yes, the dogs are in the pedigree but I see Esko is in the puppy's 4th generation. With so many dogs in a pedigree by the time you hit the 4th generation, is it reasonable to sell a pup based on one or two particular dogs/bitches in the line (particularly this far back)? Is this a common practice? Does one dog this far back really make that much of a difference to use it as a selling point?

The ad:
www.pedigreedatabase.com/gsd/classifieds/72943.html

The pedigrees of puppies:

Sire: www.pedigreedatabase.com/gsd/pedigree/537518.html
Dam: www.pedigreedatabase.com/gsd/pedigree/462953.html

well, it means the pups are linebred on Esko, so yeah it would be something you would want to see or know in an ad when looking at the puppies.

Thanks Uber, because I was looking at the two pedigrees seperately, and I didn't notice Esko listed in the linebreeding section, I failed to see that he was in both the sire and dam's lines.  Sorry, bonehead oversight on my part.  So would the answer be somewhat similar for ads that say something akin to "Urus grandson" where there is no evidence of linebreeding?  Again, just curiosity.