Early in the pandemic, cruise lines and military vessels were excellent sources of unbiased data on the infection and fatality rate of this virus, because a) the data couldn't be faked and b) everyone involved was effectively homogenous.
With the NFL, we have the same situation....we know everyone's vaxx status AND who has tested positive etc. True, professional football players aren't a random samp,et of society, but I'll take what I can get.
That Master List could be very handy in assessing this sort of thing.
And c) isolated .....................