Caravaggio, the most important of the Baroque era painters, was a killer and a thug; that does not invalidate study and appreciation of his art. Benvenuto Cellini, the 16th c. silver- and goldsmith was a liar, womanizer and a bully, but his work was great art. George Washington hated the Indians and wanted them removed from 'civilized' areas. Jumping forward, Leni Riefenstahl was a great photographer whose work is still studied by aspiring photographers, but she is tainted with the Hitler era.
Asa Earl Carter, author of "Gone to Texas" and "The Education of Little Tree," was a 'masterful storyteller' (Lawrence Clayton, in "Handbook of Texas") whose literary work, though small in volume, is appreciated. He is typical of the white people of his time and place; the South was not yet ready for racial equality and it had to be forced on them. As Clayton said, the influence of the Civil War and his Cherokee heritage are strong components of his assumed identity of Cherokee storyteller.
All of that has little bearing on the life of Grey Owl.
Grey Owl was a gentle proponent of what he perceived as the simple life of the 'Indian.' He led many into an appreciation of nature. His work with the National Parks of Canada (then Dominion Park Service) in the 1930s (his cabin in Prince Albert National Park, where he lived for a time with his Mohawk (second) wife and their two pet beavers, is preserved and often visited) was important as he introduced many children to nature. Prior to that, he had worked as a forest ranger in northern Ontario (his first wife, of that time, was also Indian). Always he will be remembered as Grey Owl. The Canadian Government blurbs for Parks call him a 'noted naturalist'.
I wish Dwayne Jensen good luck with his endeavors. Few people are more worthy of commemoration than Grey Owl, although his was not an earth-shaking role. Something that might be interesting to investigate is how many Park officials, naturalists, artists and writers in Saskatchewan-Manitoba-Ontario knew or suspected, but encouraged belief, in his authenticity. Some notes might be found in the archives of the "Group of Seven" and their contemporaries, papers of Ernest Thompson Seton, and Parks and Forest Service employment records.
Remember that Grey Owl was following the lead of Ernest Thompson Seton, the Canadian naturalist, scientist, anthromorphosist and supporter of the 'natural' way of life. Grey Owl lived the life laid out in "The Two Little Savages" (published by Seton 1903, with many reprints up to the present day). Grey Owl, born 1888, would have been 15 years old when that book came out in both England and North America.
Asa Earl Carter, as a typical white Southerner of his time, also would be a good subject for biography and film, but in no way should he be related to Grey Owl.