I am not sure on the Spanish Alano, I was very skeptical until I had read that study in the past on the DNA. That would be proof that they are a separate breed right? Even if it were a recreation I don't see the big deal. That is still somewhat the history of the breed as I'm sure these current dogs must have some original blood in them somewhere. So if it doesn't breed true its not a purebreed? That is only true somewhat. If you are a show breeder or within a certain context.
However many working breeds have a larger variance and breeds in general have different looks depending on the bloodline and source. I see a lot of variance in almost every breed out there. Unless they are show bred. Labs that vary from stocky, wider head, medium to large in size, ones that are leaner with a narrower head, some small ears and some large ears. They are one of the most popular breeds and been here for awhile yet I see so much difference in them. My infatuation with the Belgian Malinois I have seen a lot of variance. Are these not purebreds? One pair I observed and spent time with one was bred for work and one show. The working bred dog was just breath taking IMO. He was the dark color which I much love. Besides this he was big, heavier bone, slightly different head and the show dog was very lean and lanky, narrow skull, just a narrower body over all. This beautiful working dog didn't place well in the shows but he could sure do what he was bred for!! I have owned Boxers before. I have also known many. I knew several Boxers below standard in size and with bug eyes too. Poor looking things. I have seen the sharp typy show boxers.
I have also seen true working Boxers which differ from show. Many other differences in body type from sub quality dogs. Another good breed for example is the American Pit Bull Terrier, besides all the BS crap we know is mixed. Like Bandogs registered as APBT i.e. Whopper, Gotti, ect. Those that look like pure Patterdales but are registered as APBTs. We see a huge variance in the these performance types. Even the performance show dog has variance. They are true to the standard in a way but are not typy. However if you look at the American Staffordshire Terrier, descendants of APBTs they are usually extremely typy with only a few that vary. Why? Because AKC always breed extreme type without faulting on the phenotype. APBTs are bred to work and are lax on the typiness. You find this from early days on up to current but these are purebred APBTs. A lot of the strains are also very distinct in type because the foundation dogs used and the breeders eye goes into making the phenotype of the line. What is your opinion on the Fila?
I have seen a lot of different looking ones and different temperament depending on what the breeders goals and bloodlines are. Are these also a new breed? Speaking of Great Danes many are typy, but I've observed several who are not. I also noticed that there can be some big temperament differences. A lot of pet show couch potatoes but a few out there come pretty close to being able to do what they should be able to do. They have a totally different drive about them. If you just look around on the internet for a breed you will see a lot of variance in a breed depending on what the breeder is using the dogs for and their purpose.