Regarding the OP, I think the reaction of the pup (I guess almost an adult now) would depend more on the genetic line the breeder works with, reinforced by the training/treatment of the pup, than the genetic "instinct" of the pup.
I've had three Rottweilers, and been around (extensively) two more. All three that I've had have had quite a bit of training. One even had an obedience title on her.
Of my three, the current one has (despite our best efforts) had a succession of bad experiences with other dogs since he was a puppy. At this point, despite going on about wanting to meet another dog, if allowed to meet, he will invariably react with fear aggression. He is good with people, however.
The previous one was from the same breeder, and was a genetic relative of current one. He also was great with people, but also great with other dogs. He grew up with our first one already being an adult female in the house. He was steady as a rock with people and dogs. He was around several fights that our first one was in, with the other two mentioned above that I was around a lot. He never got involved. He once was attacked by a small, young pit-bull. He outweighed it so much that the first attack resulted in the pit bouncing off my Rott. It came in a second time. My Rott turned an head-butted the pit so hard that it rolled about 8 feet. Before it could recover, the owner pounced on it and got it under control. My dog never opened its mouth, showed his teeth, or made a sound. Once the owner got the pit under control, my dog went on about his business like nothing had happened. Even turned his back on the pit.
The first Rott we had would have ripped the pit apart if it had attacked her. She was from a different breeder, different line. The breeder was a schutzhunde trainer, so I suspect the dog was from a line bred to be more aggressive. She was the one that we got an obedience title on. Both she and my second (the rock) also had Canine Good Citizen papers (not training; it's based on reactions in a test). She regularly got in fights with one of my wife's parents' Rotties. Two alpha females in one house was not good.
All that to say, breeding and training will, IMO, have more of an influence than some ethereal wolf heritage or instinct, or even the breed of the dog, except maybe in extreme cases. A good genetic line can be damaged by a succession of circumstances, but an aggressive line can be largely controlled by successful, diligent training. The majority of the behavior will be individual to the dog.