-> Conversely, as far as I can tell, there has yet to be a single transgender NFL football player, while statistically there ought to be five currently playing.
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-A side note, but—this doesn't actually seem hard to explain. If the ought-to-be-five means MtFs, well, you _can't_ transition MtF and _stay_ in the NFL—HRT is going to kill your performance. Even if you think the effect size of hormones is overhyped, this is a _very_ competitive area, you can't say, "Oh, it only affected performance like ten percent, that's nothing—ten percent is _huge_." This doesn't rule out Jenner-class eggs in the NFL.
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-And if it means FtMs, well, people get into football as teenagers: there are going to be structural reasons making that difficult even if gynephilic FtMs _are_ the sort of people who would like to play (difficulty of transitioning _that_ early _and_ being stealthy about it, and difficulty of being accepted as one of the guys if you're not stealthy—let alone NFL/NCAA policy about steroid use, if the matter has even come up, which is probably hasn't)