Here is a little light detective work.
If you look at the reviews of "Sean Clarkson's" two e-books, you'll notice they both get 5 star shill reviews from reviewers "sunchaser" and "mr powers":
mr powers
sunchaser
If you look through their profiles to see what else they have reviewed, you'll notice that the only other author both of them review beside "Sean Clarkson" is one "Hunter Powers" who writes scam books about diets:
Hunter Powers
Moreover, in some cases, "sunchaser" and "mr powers" are the only reviewers of some of these books, just like they were the first reviewers of Clarkson's books. Of course all of these are 5 star shill reviews.
My conclusion is that it is very likely that "Sean Clarkson", "Hunter Powers", "sunchaser" and "mr powers" are all one and the same person. While that does not tell us who he is, it may be useful information. This character is not just a plagiarist of Fisto's stories, but also churns out diet and lifestyle scam books obviously based on scraping various lifestyle websites.
Lest someone be thrown off by this, there is a guy on the web named Hunter Powers who seems to be a high powered developer/programmer. This is certainly not the same person as the pseudonymous "Hunter Powers"/"Sean Clarkson"/"mr powers"/"sunchaser".
Hope this helps someone who has more time to dig into this.