I say he's a fighter because of his pedigree and his body condition.
Not saying you support it at all
The only way I'd lable a dog as a fighter is if I saw him with another dog, saw his pedigree, and got to watch his daily routines.
Mine has scars, because she is clumsy and had lived with 2 nasty cats as a puppy, Fight scars look different than scars from a dog pushing through bushes or hunting hogs(or whatever your guys hunt) in my experience with fighters and those who are just doing their jobs or, in my girl's case, being dead clumsy and making our pom mix mad as well
I saw quite a few people go by a male pittie and mumble about him being a fighter, after a while I went to look myself, he had scars, yes, but they were from an old embedded collar, something that looked like a burn, and scars on his face from being in a cage at the SPCA and constantly rubbing his face on the bars. He also had cropped ears, which to some makes them look mean.
Now, if your pups are at fighting weight(ribs and sometimes backbone showing), have the telltale scars up and down both front legs, face, neck, missing lip pieces, and you had things like a breeding stand, break sticks(unless you hunt hogs), and ect. I may get a bit suspicious, but I wouldn't outright say you were a fighter.
Don;t take offense, the picture of that dog just got me a bit cross