That info leads me to believe more than ever that a male was involved. Besides the amount of violence involved, the reason I am thinking that, is the isolation-most women wouldn't seek out that type of isolation. An abandoned house or a nearby woods, maybe, but not this type of isolation alone. And, many women didn't have licenses then, and few owned vehicles- unless it was a vehicle owned by the husband.
Then, after the children were killed, this woman who was so upset that she left a shoe would have had to walk out of the woods alone, on one shoe. Then drive? Hitchhike? Without anyone seeing her or noticing how upset she was?
Another point is that taking them out that far in the woods. Yet no attempt to dig the grave or even cover them with brush. A person familiar with the woods or with hunting may have been expecting that animals would find the bodies and scatter the remains. Which would be good for the murderer.
Yet, some woman covers them with a coat, which of course wouldn't be expected to stop an animal. So not a bad thing for the murderer, yet something that someone who cared a little about the boys might do.
I think what Brian meant was that the area where the bodies were found was isolated within the park, Stanley Park itself is not located in a remote area, in fact it's very close to downtown Vancouver (at the bottom of West End) and there is no need to hitch a ride to get there, just walk down any of the major westbound streets from downtown and they'll lead you right to the park's entrance (Lost Lagoon). When I was living in Seattle we'd go to Vancouver at least twice a month to see my (now ex) wife's brother (and to buy Cuban cigars for myself lol) and we've been to Stanley Park numerous times, in fact I have walked all of the main trails in the park and then some. Many areas of that park are very remote yet only a short distance from populated areas.
The park is typical of Pacific Northwest urban landscaping, in that area cities were built in densely wooded areas and part of a city's incorporated territory would be left "as is" with minimal infrastructure to serve as a wilderness retreat for city residents. Trails and convenience facilities were built but most of the acreage was left untouched, overgrown with dense rain forest vegetation so one needs not venture far from a trail to find themselves in a "remote area" where years can go by without human intrusion, all that a 30-minute walk from downtown. The West End was already developed in the 1940's although not as densely built up as it is now (it now looks more and more like Manhattan).
If someone wanted to commit murder in the city with minimal chances of being heard or seen or have the victims quickly found then Stanley Park was the perfect location: completely isolated areas were plenty and no transportation required to get there and back. As for animals scattering the remains, there are no large predators left in the park, bears, cougars and foxes had been long gone by 1947, the most likely animal to be attracted to bodies there would be seagulls and insects, and those usually eat their meal where they find it so bones are likely to be left undisturbed for years. I think that, to anyone who knows the park and has heard about details of the crime scene, the most likely suspect is the mother or at least a female who had an emotional bond with the victims.