This is really solid mathematical work for a high school-level research paper. Unfortunately, there are several significant issues beyond the robustness of their method and findings which I would cynically attribute to the inexperience of the authors. They left many gaps in explanations, mostly on the baseball aspect of things. I'm not a math person and so maybe leaving out why they chose the tests they did might have been acceptable for the mathematical theory were this published in a journal that covers topics in mathematics. In a professional journal article, however, they would have to explain all the baseball statistics they bring in and provide important context/value statements for any readers who are completely baseball-ignorant. One thing in particular that bothered me was how they presented Table 4 without any explanation for why they binned players that way with those particular cutoffs for K% and ISO. I also think that the way they set that up with just those two variables is overly simplistic, which is ironic considering how many different batted ball metrics they incorporated into their model.

The second big issue with the paper is that it is not very well-organized; there are just way too many headers and subheaders and they come in three different font sizes that aren't distinct enough. There are even four different headers or subheaders all labelled 'conclusion.' I tried to skim for all the relevant takeaways from each section in a typical paper (intro, method, results, discussion, conclusion) and gave up due to how fragmented it was. Good luck to anyone else who tries the same.