I think you could get very different styles of dogs in one breeding and very similiar styles of dogs in another. See the problem with the hypothetical questions like these is that since we arent speaking about particular dogs known to throw particular traits, but the strains in general there is a vast possibility to the outcome.

Even with similiar traits your still gonna get vastly different animals more often then not imo. Reason being is some lines are more dominant genetically then others. Ch. Yellow John x Tant's Miss Jocko created Gr. Ch. Yellow. Now if Yellow John would've been bred to an Eli bitch instead of getting the just do enough to win Gr. Ch. Yellow the genes may line up perfectly and you might get a much rougher, faster, finisher. Or the genes may not line up and you could get a litter full of curs.

Eli dogs are said to be rough, fast , high ability dogs with plenty of mouth. The story's of the past lead you to believe Jocko was similiar. But Jocko was drawing his traits from a different gene pool then Eli dogs are drawing theres. So when both crossed into Redboy your probably not gonna get the same type stuff. A few may be similiar but the majority in my opinion will be different.

Now if you had a proven producing Redboy gyp of Game plugs. And you bred her to a Eli stud who was a proven producer of hard mouth, high ability animals. And then turned around and bred her to a Stud who had a nice % of Jocko blood in him and like wise had proven to produce high ability, hard mouth animals do I think the outcome will be similiar? Maybe. I would think more so then just sticking a random Redboy dog to a random Eli dog then sticking a different random Redboy dog to a random Jocko dog, and assuming you'll get similiar offspring. But the only reason I would think so then is because all animals have proven to produce a "Type" and when crossed to what they lack theoretically you would get "complete" animals in both litters. And both litters being "complete" would make them similiar if even in the most primative way. This is jmo though and im not expert on genetics.

Vdk