Earlier quoted context omitted.
Men are stronger, faster, have more dense bones, have bigger lungs, bigger hands, etc, etc, etc. Men and women are different in hundreds of ways it's not just 'lean body mass'. Men are better at sports than women. Do you even live in reality? Have you ever completed in anything in your life?
Then create those divisions. Please be rational.
Did you actually think that lean mass would be a sensible way to separate divisions in a gender neutral fashion? That would, again, just result in women being unable to compete professionally in virtually any sport. They would be relegated to Division N, for some very large value of N. Competing alongside multitudes of biologically male amateurs, where nobody cares and nobody pays to watch. To even entertain this idea betrays a total lack of understanding of the matter at hand.
Right now you are acting like Elon Musk storming into the government and having 20 year olds cut everybody's budget. You may think you're coming in with fresh outsider perspective and an open minded way to look at things and improve them, but everyone actually involved in the domain can see a trainwreck in progress. It's not a good look.
I am quite certain it's not your intention, but you're really coming across as someone who hates women's sports, and doesn't want them to exist. On behalf of my wife and sister and a lot of the women I've known in a lifetime of playing sports - kindly keep your awful ideas to yourself. Women fought tooth and nail for the right to have their own professional sporting opportunities. Don't you dare try to take it away from them.